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Journal articles on the topic '1,1,3,3-tetraorganodisiloxanes'

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Published: 6 September 2023

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1

Shankar, Ravi, Asmita Sharma, Bhawana Jangir, Manchal Chaudhary, and Gabriele Kociok-Köhn. "Catalytic oxidation of diorganosilanes to 1,1,3,3-tetraorganodisiloxanes with gold nanoparticle assembly at the water–chloroform interface." New Journal of Chemistry 43, no. 2 (2019): 813–19. http://dx.doi.org/10.1039/c8nj04223c.

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The synthesis of 1,1,3,3-tetraorganodisiloxanes from the hydrolytic oxidation of diorganosilanes, RR¹SiH₂, using AuNPs as an interfacial catalyst is described. This study provides a manifestation of the photothermal effect in enhancing the catalytic activity at ambient temperature.

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2

Frampton, C. S., and K. E. B. Parkes. "1,1,3,3-Tetramethylurea." Acta Crystallographica Section C Crystal Structure Communications 52, no. 12 (December 15, 1996): 3246–48. http://dx.doi.org/10.1107/s0108270196011146.

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3

Deng, Jia. "1,1,3,3-Tetramethyldisiloxane." Synlett 2011, no. 14 (July 21, 2011): 2102–3. http://dx.doi.org/10.1055/s-0030-1260971.

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4

Fleischer, H., K. Hensen, D. Burgdorf, E. Flindt, U. Wannagat, H. B�rger, and G. Pawelke. "1,1,3,3-Tetrachlordisilazan." Zeitschrift f�r anorganische und allgemeine Chemie 621, no. 2 (February 1995): 239–48. http://dx.doi.org/10.1002/zaac.19956210213.

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5

Vitorino, Joana, Filipe Agapito, M. Fátima M. Piedade, Carlos E. S. Bernardes, Hermínio P. Diogo, João P. Leal, and Manuel E. Minas da Piedade. "Thermochemistry of 1,1,3,3-tetramethylguanidine and 1,1,3,3-tetramethylguanidinium nitrate." Journal of Chemical Thermodynamics 77 (October 2014): 179–89. http://dx.doi.org/10.1016/j.jct.2014.01.007.

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6

Gabbutt, Christopher D., B. Mark Heron, Janice M. McCreary, and David A. Thomas. "Unusual Aminations with Tetramethylguanidine." Journal of Chemical Research 2002, no. 2 (February 2002): 69–71. http://dx.doi.org/10.3184/030823402103171302.

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7

Fluck, Ekkehard, Winfried Plass, Gernot Heckmann, Hartmut Bögge, and Achim Müller. "1λ5,3 λ5-Diphosphorine (1 λ5,3 λ5-Diphosphabenzole), III [1, 2] / 1 λ5,3 λ5-Diphosphorines (1 λ5,3 λ5-Diphosphabenzenes), III [1, 2]." Zeitschrift für Naturforschung B 46, no. 2 (February 1, 1991): 202–8. http://dx.doi.org/10.1515/znb-1991-0214.

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1,1,3,3-Tetrakis(dimethylamino)-diphosphete (3) reacts with diphenylacetylene and bis(trimethylsilyl)butadiin-1 ,3 to give 1,1,3,3-tetrakis(dimethylamino)-4,5-diphenyl-1 λ5,3λ5- diphosphorine (8) and 1,1,3,3-tetrakis(dimethylamino)-5-trimethylsilyl-4-(trimethylsilyl-ethinyl)-1λ5,3 λ5-diphosphorine (9). The new compounds are characterized by their NMR , mass and IR spectra. In addition, the results of an X-ray structure analysis of 9 are reported.

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8

Foitzik, Richard C., Steven E. Bottle, Jonathan M. White, and Peter J. Scammells. "Synthesis of 1,1,3,3-Tetraalkylisoindolines Using a Microwave-Assisted Grignard Reaction." Australian Journal of Chemistry 61, no. 3 (2008): 168. http://dx.doi.org/10.1071/ch08008.

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1,1,3,3-Tetraalkylisoindolines are important intermediates in the preparation of stable nitroxides, such as 1,1,3,3-tetramethylisoindolin-2-oxyl, 1, and 1,1,3,3-tetraethylisoindolin-2-oxyl, 2. The limiting step in their preparation is the Grignard reaction between N-benzylphthalimide and the appropriate alkyl magnesium bromide, which typically proceeds in yields of ~28–40%. A microwave-assisted variation of this reaction has been optimized to give improved yields and reduced reaction times (45–60% and 2 h, respectively).

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9

Kaupang, Åsmund, Carl Henrik Görbitz, and Tore Bonge-Hansen. "A solid-state oxidation of 1,1,3,3-tetramethylguanidinium 4-methylbenzenesulfinate to 1,1,3,3-tetramethylguanidinium 4-methylbenzenesulfonate." Acta Crystallographica Section C Crystal Structure Communications 69, no. 7 (June 8, 2013): 778–80. http://dx.doi.org/10.1107/s0108270113015011.

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The organic acid–base complex 1,1,3,3-tetramethylguanidinium 4-methylbenzenesulfonate, C5H14N3+·C7H7O3S−, was obtained from the corresponding 1,1,3,3-tetramethylguanidinium 4-methylbenzenesulfinate complex, C5H14N3+·C7H7O2S−, by solid-state oxidation in air. Comparison of the two crystal structures reveals similar packing arrangements in the monoclinic space groupP21/c, with centrosymmetric 2:2 tetramers being connected by four strong N—H...O=S hydrogen bonds between the imine N atoms of two 1,1,3,3-tetramethylguanidinium bases and the O atoms of two acid molecules.

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10

Criado, A., M. J. Diánez, S. Pérez-Garrido, I. M. L. Fernandes, M. Belsley, and E. de Matos Gomes. "1,1,3,3-Tetramethylguanidinium dihydrogenorthophosphate." Acta Crystallographica Section C Crystal Structure Communications 56, no. 7 (July 1, 2000): 888–89. http://dx.doi.org/10.1107/s0108270100005187.

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11

Şendıl, Kıvılcım, H. Beytiye Özgün, and Ebru Üstün. "Two New 1,1,3,3-Tetramethylguanidinium Halochromates (C5H14N3CrO3X) (X: Cl, F): Efficient Reagents for Oxidation of Organic Substrates under Solvent-Free Conditions and Microwave Irradiation." Journal of Chemistry 2016 (2016): 1–7. http://dx.doi.org/10.1155/2016/3518102.

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Two new mild oxidizing agents 1,1,3,3-tetramethylguanidinium fluorochromate (TMGFC) and 1,1,3,3-tetramethylguanidinium chlorochromate (TMGCC) were prepared in high yields by reacting tetramethylguanidine with CrO3and related acid. These reagents are suitable to oxidize various primary and secondary alcohols and oximes to the corresponding carbonyl compounds under solvent-free conditions and microwave irradiation.

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12

Chojnacki, Jaroslaw, Andrzej Robaszkiewicz, Eberhard Matern, Elke Baum, and Jerzy Pikies. "cis-Dichloro(di-tert-butylphosphine-κP)(triphenylphosphine-κP)platinum(II) tetrahydrofuran hemisolvate." Acta Crystallographica Section E Structure Reports Online 63, no. 3 (February 7, 2007): m680—m682. http://dx.doi.org/10.1107/s1600536807005259.

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The title compound, [PtCl2(C8H19P)(C18H15P)]·0.5C4H8O, was obtained in the reaction of bis(triphenylphosphine)platinum(II) chloride with 1,1,3,3-tetra-tert-butyl-2-trimethylsilyltriphosphine. The 31P{1H} NMR spectrum of the reaction mixture shows the formation of the title compound together with a significant amount of triphenylphosphine and 1,1,3,3-tetra-tert-butyltriphosphine.

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13

Tiritiris, Ioannis. "2-Acetyl-1,1,3,3-tetramethylguanidine." Acta Crystallographica Section E Structure Reports Online 68, no. 10 (September 26, 2012): o2996. http://dx.doi.org/10.1107/s1600536812039724.

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14

Fuks, Gad, Nathalie Saffon, Didier Bourissou, and Guy Bertrand. "2,2,4,4-Tetrabromo-1,1,3,3-tetramethylcyclodiborazane." Acta Crystallographica Section E Structure Reports Online 63, no. 11 (October 31, 2007): o4476. http://dx.doi.org/10.1107/s1600536807052385.

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The title compound, C4H12B2Br4N2, contains an almost square four-membered ring that results from the head-to-tail dimerization of the dimethylaminodibromoborane. The dimer has almost mmm symmetry and does have 2/m crystallographic symmetry. The crystal structure involves C—H...Br hydrogen bonds.

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15

Gilardi, R., C. George, and J. L. Flippen-Anderson. "Structure of 1,1,3,3-tetranitrocyclobutane." Acta Crystallographica Section C Crystal Structure Communications 48, no. 9 (September 15, 1992): 1680–81. http://dx.doi.org/10.1107/s0108270192000702.

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16

Kropidłowska, Anna, Ilona Turowska-Tyrk, and Barbara Becker. "1,3-Diethyl-1,1,3,3-tetraphenyldisiloxane." Acta Crystallographica Section E Structure Reports Online 63, no. 2 (January 24, 2007): o855—o857. http://dx.doi.org/10.1107/s1600536807002139.

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17

Tamao, Kohei. "ChemInform Abstract: 1,1,3,3-Tetramethyldisilazane." ChemInform 43, no. 27 (June 11, 2012): no. http://dx.doi.org/10.1002/chin.201227242.

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18

Gorbunova, Marina N., and Aleksandr Aleksandrovich Maltsev. "Radical copolymerization of 2,2-diallyl-1,1,3,3-tetraethylguanidinium chloride with acrylic acid." Вестник Пермского университета. Серия «Химия» = Bulletin of Perm University. CHEMISTRY 12, no. 2 (2022): 99–106. http://dx.doi.org/10.17072/2223-1838-2022-2-99-106.

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Radical copolymerization of 2,2-diallyl-1,1,3,3-tetraethylguanidium chloride with acrylic acid in bulk and in organic solution has been studied. It has been established that the copolymerization proceeds with the formation of acid-enriched random copolymers. Kinetic regularities of the copolymerization reaction were investigated and it was found that with increasing proportion of 2,2-diallyl-1,1,3,3-tetraethylguanidinium chloride in the initial monomer mixture, the rate of the copolymerization reaction decreases.

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19

Kantlehner, Willi, Ivo C. Ivanov, and Ioannis Tiritiris. "Orthoamides and Iminium Salts, LXXV [1]. Contribution to the Formation of 2-Formyl-1,1,3,3-tetramethylguanidine and the Isomeric 1,1-Dimethyl-3-dimethylaminomethylene-urea." Zeitschrift für Naturforschung B 67, no. 4 (April 1, 2012): 331–36. http://dx.doi.org/10.1515/znb-2012-0406.

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2-Formyl-1,1,3,3-tetramethylguanidine (1) could be prepared from tris(dimethylamino)ethoxymethane (3a) and formamide (4). Surprisingly, guanidine 1 does not result from the reaction of 1,1,3,3-tetramethylguanidine with formylating reagents such as dimethylamino-methoxy-acetonitrile (8) or the N,N-dimethylformamide-dimethylsulfate adduct (9), rather the isomeric 1,1-dimethyl-3- dimethylaminomethylene-urea (2) is formed. The structure of 2 was confirmed by NMR spectroscopy and crystal structure analysis.

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20

Addala, Abderezak, Zouaoui Setifi, Yukio Morimoto, Beñat Artetxe, Takashi Matsumoto, Juan M. Gutiérrez-Zorrilla, and Christopher Glidewell. "Six tris(bipyridyl)iron(II) complexes with 2-substituted 1,1,3,3-tetracyanopropenide, perchlorate and tetrafluoridoborate anions; order versus disorder, hydrogen bonding and C—N...π interactions." Acta Crystallographica Section E Crystallographic Communications 74, no. 12 (November 6, 2018): 1717–26. http://dx.doi.org/10.1107/s2056989018015426.

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Structures are reported for six closely related salts of tris(bipyridyl)iron(II) cations, namely tris(2,2′-bipyridine)iron(II) bis(1,1,3,3-tetracyano-2-methoxypropenide) 0.776-hydrate, [Fe(C10H8N2)3](C8H3N4O)2.0.776H2O, (I), tris(2,2′-bipyridine)iron(II) 1,1,3,3-tetracyano-2-(propylsulfanyl)propenide perchlorate, [Fe(C10H8N2)3](C10H7N4S)(ClO4), (II), tris(5,5′-dimethyl-2,2′-bipyridine)iron(II) 1,1,3,3-tetracyano-2-methoxypropenide tetrafluoridoborate ethanol 0.926-solvate, [Fe(C12H12N2)3](C8H3N4O)(BF4).0.926C2H2O, (III), tris(5,5′-dimethyl-2,2′-bipyridine)iron(II) 1,1,3,3-tetracyano-2-ethoxypropenide tetrafluoridoborate, [Fe(C12H12N2)3](C9H5N4O)(BF4), (IV), tris(5,5′-dimethyl-2,2′-bipyridine)iron(II) 1,1,3,3-tetracyano-2-(ethylsufanyl)propenide tetrafluoridoborate, [Fe(C12H12N2)3](C9H5N4S)(BF4), (V), and tris(5,5′-dimethyl-2,2′-bipyridine)iron(II) 1,1,3,3-tetracyano-2-propoxypropenide tetrafluoridoborate, [Fe(C12H12N2)3](C10H7N4O)(BF4), (VI). In compound (I), one of the anions is disordered over two sets of atomic sites with equal occupancies while, in the second anion, just one of the C(CN)2 units is disordered, again over two sets of atomic sites with equal occupancies: the anionic components are linked by multiple C—H...N hydrogen bonds to form a three-dimensional framework. In compound (II), the polynitrile anion is disordered over two sets of atomic sites with occupancies in the approximate ratio 3:1, while the perchlorate anion is disordered over three sets of atomic sites: there are C—N...π interactions between the cations and the polynitrile anion. The polynitrile anion in compound (III) is fully ordered, but the tetrafluoridoborate anion is disordered over two sets of atomic sites with occupancies 0.671 (4) and 0.329 (4): the cations and the tetrafluoridoborate anions are linked by C—H...F interactions to form an interrupted chain. Compounds (IV) and (V) are isostructural and all of the ionic components are fully ordered in both of them: the cations and tetrafluoridoborate anions are linked into C 2 2(12) chains. The polynitrile anion in compound (VI) is disordered over two sets of atomic sites with approximately equal occupancies, and here the chains formed by the cations and the tetrafluoridoborate anions are of the C 2 2(13) type.

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21

Plass, Winfried, Gernot Heckmann, Ekkehard Fluck, Carl Krüger, and Stefan Werner. "Die Reaktion von 1,1,3,3-Tetrakis(dimethylamino)-1 λ5,3 λ5-diphosphet mit Nitrilen / The Reaction of 1,1,3,3-Tetrakis(dimethylamino)-1 λ5,3 λ5-diphosphete with Nitriles." Zeitschrift für Naturforschung B 45, no. 11 (November 1, 1990): 1487–94. http://dx.doi.org/10.1515/znb-1990-1104.

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Reaction of 1,1,3,3-tetrakis(dimethylamino)-lλ5,3λ5-diphosphete (1) with perfluorobenzonitrile yields 1,1,3,3-tetrakis(dimethylamino)-4-(4-cyano-2,3,5,6-tetrafluorophenyl)-1 -fluoro-1λ5,3λ5-diphosphabuta-1,3-diene (3); reaction of 1 with benzoisonitrile gives 2,2,4,4-tetrakis(dimethylamino)-1-isocyano-1-phenyl-2λ5,4λ5-diphosphapenta-1,3-diene (4). The new products 3 and 4 are characterized by their NMR, mass, and IR spectra. The mechanism of formation is discussed. The structure of 3 was elucidated by an X-ray structural analysis.

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22

Jüschke, Ralf, Gerald Henkel, and Peter Sartori. "Synthese und Struktur von Kalium-4,4-difluor-[1,3,2]dithiazetidinid-1,l,3,3-tetraoxid und Rubidium-4,4,5,5-tetrafluor-[1,3,2]dithiazolidinid-1,1,3,3-tetraoxid / Syntheses and Structure of Potassium-4,4-difluoro-[1,3,2]dithiazetidinide-1,1,3,3- tetraoxide and Rubidium-4,4,5,5-tetrafluoro-[ 1,3,2]dithiazolidinide-1,1,3,3-tetraoxide." Zeitschrift für Naturforschung B 52, no. 3 (March 1, 1997): 359–66. http://dx.doi.org/10.1515/znb-1997-0311.

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Abstract Reactions of perfluoroalkane-1,n-bis(sulfonylfluorides) (n = 1-2) (1-2) with liquid ammonia in tetrahydrofuran (TH F) lead to the cyclic ammonium imides 3-4. These cyclic imides 3-4 can easily be transform ed to other salts using the corresponding hydroxides. X -ray structure analyses (T = 150 K) were perform ed for the potassium 4,4-difluoro-[1,3,2]dithiazetidinide-1,1,3,3-tetraoxide 5 and rubidium -4,4,5,5-tetrafluoro-[1,3,2]dithiazolidinide-1,1,3,3-tetraoxide 6. Cylic imides of the type 3, 5 have not been reported previously. Their formation and their nmr-data are discussed.

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23

Elnagar, Hassan Y., Mahmood Sabahi, Vince J. Gatto, and Frank R. Fronczek. "2,5-Bis(1,1,3,3-tetramethylbutyl)thiophene." Acta Crystallographica Section E Structure Reports Online 64, no. 12 (November 20, 2008): o2396. http://dx.doi.org/10.1107/s1600536808037434.

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24

Amini, Mostafa M., Shabnam Hossein Abadi, Mahdi Mirzaee, Thomas Lügger, F. Ekkehardt Hahn, and Seik Weng Ng. "Bis(1,1,3,3-tetramethyl-1,3-dibenzoatodistannoxane)." Acta Crystallographica Section E Structure Reports Online 58, no. 12 (November 15, 2002): m697—m699. http://dx.doi.org/10.1107/s1600536802020020.

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25

Gassman, Paul G., Daniel A. Singleton, and Hiroyuki Kagechika. "The unsymmetrical 1,1,3,3-tetramethylallyl cation." Journal of the American Chemical Society 113, no. 16 (July 1991): 6271–72. http://dx.doi.org/10.1021/ja00016a054.

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26

Bernard, Josef, Christoph Schnieders, and Klaus Müllen. "Lithium 2-lithio-1,1,3,3-tetraphenylpropenide." J. Chem. Soc., Chem. Commun., no. 1 (1985): 12–14. http://dx.doi.org/10.1039/c39850000012.

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27

Smith, Graham, and Urs D. Wermuth. "1,1,3,3-Tetraethylisoindolin-2-ium chloride." Acta Crystallographica Section E Structure Reports Online 68, no. 3 (February 10, 2012): o659. http://dx.doi.org/10.1107/s1600536812004588.

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28

Knorr, Rudolf, Thomas Menke, Johannes Freudenreich, and Claudio Pires. "Carbenoid-mediated nucleophilic “hydrolysis” of 2-(dichloromethylidene)-1,1,3,3-tetramethylindane with DMSO participation, affording access to one-sidedly overcrowded ketone and bromoalkene descendants§." Beilstein Journal of Organic Chemistry 10 (January 31, 2014): 307–15. http://dx.doi.org/10.3762/bjoc.10.28.

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2-(Dichloromethylidene)-1,1,3,3-tetramethylindane was “hydrolyzed” by solid KOH in DMSO as the solvent at ≥100 °C through an initial chlorine particle transfer to give a Cl,K-carbenoid. This short-lived intermediate disclosed its occurrence through a reversible proton transfer which competed with an oxygen transfer from DMSO that created dimethyl sulfide. The presumably resultant transitory ketene incorporated KOH to afford the potassium salt of 1,1,3,3-tetramethylindan-2-carboxylic acid (the product of a formal hydrolysis). The lithium salt of this key acid is able to acylate aryllithium compounds, furnishing one-sidedly overcrowded ketones along with the corresponding tertiary alcohols. The latter side-products (ca. 10%) were formed against a substantially increasing repulsive resistance, as testified through the diminished rotational mobility of their aryl groups. As a less troublesome further side-product, the dianion of the above key acid was recognized through carboxylation which afforded 1,1,3,3-tetramethylindan-2,2-dicarboxylic acid. Brominative deoxygenation of the ketones furnished two one-sidedly overcrowded bromoalkenes. Some presently relevant properties of the above Cl,K-carbenoid are provided in Supporting Information File 1.

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29

Zerbe, Eva-Maria, Christoph Wölper, and Peter G. Jones. "Aminkomplexe von Silber(I)-disulfonylamiden, Teil I: Sekund¨are Amine [1]." Zeitschrift für Naturforschung B 66, no. 5 (May 1, 2011): 449–58. http://dx.doi.org/10.1515/znb-2011-0503.

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We report the crystal structures of five amine-complexed silver(I) disulfonylamides of composition L2AgX (L = secondary amine, X = disulfonylamide anion) [1: bis(2,2,6,6-tetramethylpiperidine)- silver(I) dimesylamide, 2: bis(2,2,6,6-tetramethylpiperidine)(1,1,3,3-tetraoxo-1,3,2-benzodithiazolido) silver(I), 3: bis(diethylamine)(dimesylamido)silver(I), 4: bis(diethylamine)silver(I) 1,1,3,3-tetraoxo- 1,3,2-benzodithiazolide, 5: bis(dicyclohexylamine)silver(I) 1,1,3,3-tetraoxo-1,3,2-benzodithiazolide]. In the solid state 1, 4 and 5 are ionic compounds, whereas 2 and 3 appear to be molecular, but with long Ag-Ndisulfonylamide bonds (ca. 2.5 Å ), almost linear Namine-Ag-Namine bond angles (171, 158°) and S-N bond lengths more typical of purely ionic disulfonylamides. The packing of these complexes is governed by the formation of chains via motifs of Ag・・・O contacts and classical hydrogen bonds. The interaction motifs vary slightly depending on the steric demand of the amine substituents. For the molecular compounds, either new motifs appear (3) or intramolecular classical hydrogen bonds are formed, and linear arrays of molecules are generated by non-classical hydrogen bonds (2)

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30

Regnier, Vianney, Florian Molton, Christian Philouze, and David Martin. "An air-persistent oxyallyl radical cation with simple di(methyl)amino substituents." Chemical Communications 52, no. 76 (2016): 11422–25. http://dx.doi.org/10.1039/c6cc06260a.

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31

Zhou, Jiangjun, Mang Wu, Qiang Peng, Feng Jiang, Haowei Pan, Baoxia Wang, Shengquan Liu, and Zhongkai Wang. "Highly efficient strategies toward sustainable monomers and polymers derived from fatty acids via tetramethylguanidine promoted esterification." Polymer Chemistry 9, no. 21 (2018): 2880–86. http://dx.doi.org/10.1039/c8py00505b.

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32

Bortoluzzi, Marco, Fabio Marchetti, Guido Pampaloni, and Stefano Zacchini. "A crystallographically characterized salt of self-generated N-protonated tetraethylurea." Chemical Communications 51, no. 7 (2015): 1323–25. http://dx.doi.org/10.1039/c4cc08801h.

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33

Strohmann, Carsten, and Eric Wack. "Bis-, Tris- and Tetrakis(lithiomethyl)germanes: New Building Blocks for Organogermanium Compounds." Zeitschrift für Naturforschung B 59, no. 11-12 (December 1, 2004): 1570–78. http://dx.doi.org/10.1515/znb-2004-11-1230.

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Bis(lithiomethyl)germanes, R2Ge(CH2Li)2, tris(lithiomethyl)germanes, RGe(CH2Li)3, and tetrakis( lithiomethyl)germane, Ge(CH2Li)4, were prepared by the reductive C-S bond cleavage with lithium naphthalenide (LiC10H8) or lithium p,p’-di-tert-butylbiphenylide (LiDBB) and characterized by trapping with Bu3SnCl. The bis(lithiomethyl)germanes were used for the synthesis of 1,1-dimethyl-3,3-diphenyl-1-germa-3-silacyclobutane, 1,1-diethyl-3,3-diphenyl-1-germa-3-silacyclobutane, 1,1,3,3-tetraphenyl-1-germa-3-silacyclobutane and 1,1,3,3-tetraphenyl-1,3-digermacyclobutane. The single-crystal X-ray diffraction studies of methyltris(phenylthiomethyl)germane and tetrakis(phenylthiomethyl)germane, starting materials for the corresponding poly(lithiomethyl) germanes, indicate tetrahedrally arranged substituents at the germanium atoms.

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34

Wayner, Danial D. M., and Donald R. Arnold. "1,n-Radical ions. Photosensitized (electron transfer) and electrochemical oxidation of 1,1,2,2-tetraphenylcyclopropane." Canadian Journal of Chemistry 63, no. 4 (April 1, 1985): 871–81. http://dx.doi.org/10.1139/v85-145.

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The photosensitized (electron transfer) and the electrochemical oxidation of 1,1,2,2-tetraphenylcyclopropane (1) have been studied. The products obtained from the photosensitized (electron transfer) study are 1,1,3,3-tetraphenylpropene (2), 1,3,3-triphenylindene (3), tetraphenylallene (4), and 3-methoxy-1,1,3,3-tetraphenylpropene (8). The product ratios are dramatically dependent upon the reaction conditions, particularly sensitizer (aromatic nitriles, tetracyanoethylene, chloranil, and 2,3-dichloro-5,6-dicyanobenzoquinone were used), and solvent. The variations in product ratios are attributed to variations in the redox behaviour of the sensitizer radical anion and upon the basicity and nucleophilicity of the medium. The products in the electrochemical study are 3, 4, and 8. Common intermediates have been identified and a mechanism for the formation of products is proposed.

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35

O'Leary, Brian, Trevor R. Spalding, George Ferguson, and Christopher Glidewell. "Oligosiloxanediols as building blocks for supramolecular chemistry: hydrogen-bonded adducts with amines form supramolecular structures in zero, one and two dimensions." Acta Crystallographica Section B Structural Science 56, no. 2 (April 1, 2000): 273–86. http://dx.doi.org/10.1107/s0108768199013051.

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The structure of 1,1,3,3,5,5-hexaphenyltrisiloxane-1,5-diol–pyrazine (4/1), (C36H32O4Si3)4·C4H4N2 (1), contains finite centrosymmetric aggregates; the diol units form dimers, by means of O—H...O hydrogen bonds, and pairs of such dimers are linked to the pyrazine by means of O—H...N hydrogen bonds. In 1,1,3,3,5,5-hexaphenyltrisiloxane-1,5-diol–pyridine (2/3), (C36H32O4Si3)2·(C5H5N)3 (2), the diol units are linked into centrosymmetric pairs by means of disordered O—H...O hydrogen bonds: two of the three pyridine molecules are linked to the diol dimer by means of ordered O—H...N hydrogen bonds, while the third pyridine unit, which is disordered across a centre of inversion, links the diol dimers into a C 3 3(9) chain by means of O—H...N and C—H...O hydrogen bonds. In 1,1,3,3-tetraphenyldisiloxane-1,3-diol–hexamethylenetetramine (1/1), (C24H22O3Si2)·C6H12N4 (3), the diol acts as a double donor and the hexamethylenetetramine acts as a double acceptor in ordered O—H...N hydrogen bonds and the structure consists of C 2 2(10) chains of alternating diol and amine units. In 1,1,3,3-tetraphenyldisiloxane-1,3-diol–2,2′-bipyridyl (1/1), C24H22O3Si2·C10H8N2 (4), there are two independent diol molecules, both lying across centres of inversion and therefore both containing linear Si—O—Si groups: each diol acts as a double donor of hydrogen bonds and the unique 2,2′-bipyridyl molecule acts as a double acceptor, thus forming C 2 2(11) chains of alternating diol and amine units. The structural motif in 1,1,3,3-tetraphenyldisiloxane-1,3-diol–pyrazine (2/1), (C24H22O3Si2)2·C4H4N2 (5), is a chain-of-rings: pairs of diol molecules are linked by O—H...O hydrogen bonds into centrosymmetric R 2 2(12) dimers and these dimers are linked into C 2 2(13) chains by means of O—H...N hydrogen bonds to the pyrazine units. 1,1,3,3-Tetraphenyldisiloxane-1,3-diol–pyridine (1/1), C24H22O3Si2·C5H5N (6), and 1,1,3,3-tetraphenyldisiloxane-1,3-diol–pyrimidine (1/1), C24H22O3Si2·C4H4N2 (7), are isomorphous: in each compound the amine unit is disordered across a centre of inversion. The diol molecules form C(6) chains, by means of disordered O—H...O hydrogen bonds, and these chains are linked into two-dimensional nets built from R 6 6(26) rings, by a combination of O—H...N and C—H...O hydrogen bonds.

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36

Li, Kai, Zheng Li, Yong Shen, Xiaohui Fu, Chongyi Chen, and Zhibo Li. "Organobase 1,1,3,3-tetramethyl guanidine catalyzed rapid ring-opening polymerization of α-amino acid N-carboxyanhydrides adaptive to amine, alcohol and carboxyl acid initiators." Polymer Chemistry 13, no. 5 (2022): 586–91. http://dx.doi.org/10.1039/d1py01508g.

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For amine, hydroxyl and carboxyl terminated initiators, the organobase 1,1,3,3-tetramethylguanidine (TMG) catalyzes the rapid polymerization to afford polypeptides with controllable molecular weights and dispersities.

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37

Fluck, Ekkehard, Gerd Becker, Bernhard Neumüller, Robert Kneb, Gemot Heckman, and Heinz Riffel. "Ein Derivat des 1λ5,3λ5,5λ3-Triphosphabenzols / A Derivative of 1λ5,3λ5,5λ3-Triphosphabenzene." Zeitschrift für Naturforschung B 42, no. 10 (October 1, 1987): 1213–21. http://dx.doi.org/10.1515/znb-1987-1001.

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Abstract The title compound was prepared by reacting 1,1,3,3-tetrakis(dimethylamino)-1λ5,3λ5-diphosphete with 2,2-dimethylpropylidynephosphane and characterized by NMR spectra and X-ray structure analysis.

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38

Iimura, Tomohiro, Naohiko Akasaka, Tomoyuki Kosai, and Takeaki Iwamoto. "A Pt(0) complex with cyclic (alkyl)(amino)silylene and 1,3-divinyl-1,1,3,3-tetramethyldisiloxane ligands: synthesis, molecular structure, and catalytic hydrosilylation activity." Dalton Transactions 46, no. 27 (2017): 8868–74. http://dx.doi.org/10.1039/c7dt01113j.

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39

Neuba, Adam, Ulrich Flörke, and Gerald Henkel. "2-[2-(Benzylsulfanyl)phenyl]-1,1,3,3-tetramethylguanidine." Acta Crystallographica Section E Structure Reports Online 67, no. 5 (April 22, 2011): o1202—o1203. http://dx.doi.org/10.1107/s1600536811014577.

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40

Shi, Da-Xin, Li-Jun Zhang, Qi Zhang, and Jia-Rong Li. "2-Methyl-1,1,3,3-tetraphenylpropan-2-ol." Acta Crystallographica Section E Structure Reports Online 64, no. 6 (May 21, 2008): o1115. http://dx.doi.org/10.1107/s1600536808014761.

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41

Özcan, Özlem, Zeynep Gültekin, Wolfgang Frey, and Tuncer Hökelek. "2-Methoxymethyl-1,3-dithiolane 1,1,3,3-tetraoxide." Acta Crystallographica Section E Structure Reports Online 59, no. 6 (May 9, 2003): o747—o749. http://dx.doi.org/10.1107/s1600536803009371.

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42

Gültekin, Zeynep, Wolfgang Frey, and Tuncer Hökelek. "2-Methoxymethyl-1,3-dithiepane 1,1,3,3-tetraoxide." Acta Crystallographica Section E Structure Reports Online 59, no. 9 (August 8, 2003): o1251—o1253. http://dx.doi.org/10.1107/s1600536803016684.

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43

GILARDI, R., C. GEORGE, and J. L. FLIPPEN-ANDERSON. "ChemInform Abstract: Structure of 1,1,3,3-Tetranitrocyclobutane." ChemInform 23, no. 51 (December 22, 1992): no. http://dx.doi.org/10.1002/chin.199251039.

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44

Wiese, Dietmar, Ulrich Wannagat, Ulf Thewalt, and Tony Debaerdemae. "1,3-Bis(2-benzoylphenyl)-1,1,3,3-tetramethyldisiloxan." Chemische Berichte 120, no. 6 (June 1987): 873–78. http://dx.doi.org/10.1002/cber.19871200602.

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45

Schmidbaur, Hubert, Christos Paschalidis, Oliver Steigelmann, and Gerhard Müller. "5-Methyl-1,1,3,3-tetraphenyl-1λ5,3λ5-diphosphabenzol." Angewandte Chemie 102, no. 5 (May 1990): 569–71. http://dx.doi.org/10.1002/ange.19901020523.

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46

Basenko, S. V., A. A. Maylyan, and A. S. Soldatenko. "New Approach to the Synthesis of Symmetrical 1,3-Dichloro-1,1,3,3-Tetraorganyl- and 1,1,3,3-Tetrachloro-1,3- Diorganyldisiloxanes." Silicon 10, no. 2 (December 28, 2016): 465–70. http://dx.doi.org/10.1007/s12633-016-9474-0.

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47

Li, Qianbiao, Taisheng Wang, Jingwen Dai, Chao Ma, Bangkun Jin, and Ruke Bai. "A facile one pot strategy for the synthesis of well-defined polyacrylates from acrylic acid via RAFT polymerization." Chem. Commun. 50, no. 25 (2014): 3331–34. http://dx.doi.org/10.1039/c3cc49286a.

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Linear and hyperbranched polyacrylates were successfully synthesized by the combination of in situ esterification of acrylic acid with halogenated compounds promoted by 1,1,3,3-tetramethylguanidine (TMG) and RAFT polymerization.

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48

Egorov, Ilya N., Vladimir L. Rusinov, and Oleg N. Chupakhin. "Synthesis of Chiral Pyrimidin-2(1H)-ones from N-Carbamoyl Amino Acids." Zeitschrift für Naturforschung B 68, no. 11 (November 1, 2013): 1253–58. http://dx.doi.org/10.5560/znb.2013-3129.

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A series of previously unknown pyrimidin-2(1H)-ones containing chiral amino acid fragments was synthesized from 1,1,3,3-tetramethoxypropane and N-carbamoyl derivatives of amino acids under acidic conditions.

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49

Yaghoubi Kalurazi, Sorayya, Kurosh Rad-Moghadam, and Shahram Moradi. "Efficient catalytic application of a binary ionic liquid mixture in the synthesis of novel spiro[4H-pyridine-oxindoles]." New Journal of Chemistry 41, no. 18 (2017): 10291–98. http://dx.doi.org/10.1039/c7nj01858d.

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Novel pyrazole-fused spiro[4H-pyridine-oxindoles] were synthesized under the catalysis of the binary ionic liquid mixture [1,1,3,3-tetramethylguanidinium chloride][1-methylimidazolium-3-sulfonate] in solvent-free conditions.

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50

Santos, Evelyn C. S., Thiago C. dos Santos, Renato B. Guimarães, Lina Ishida, Rafael S. Freitas, and Célia M. Ronconi. "Guanidine-functionalized Fe3O4 magnetic nanoparticles as basic recyclable catalysts for biodiesel production." RSC Advances 5, no. 59 (2015): 48031–38. http://dx.doi.org/10.1039/c5ra07331f.

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Two organic superbases, 1,5,7-triazabicyclo[4,4,0]dec-5-ene (TBD) and 1,1,3,3-tetramethylguanidine (TMG), were anchored onto silica-coated and uncoated iron oxide nanoparticles, resulting in three recoverable basic nanocatalysts.

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