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Artículos de revistas sobre el tema "Formation de liaisons C-N"

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Publicado: 25 de mayo de 2024

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1

Raczyńska, Ewa D., Christian Laurence y Michel Berthelot. "Basicité de liaison hydrogène de formamidines substituées sur l'azote imino". Canadian Journal of Chemistry 70, n.º 8 (1 de agosto de 1992): 2203–8. http://dx.doi.org/10.1139/v92-276.

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The basicity of the hydrogen bonds of formamidines 1–19 was measured by means of the formation constant KHB of their complexes with p-fluorophenol and the frequency shift Δν(OH) of methanol hydrogen-bonded to 1–19. The study of the ν(C=N) band shows that hydrogen bonding takes place with the imino nitrogen atom. On the hydrogen-bonding basicity scale, the formamidines appear to be more basic than the corresponding amides and pyridines, and as basic as the imidazoles. The field effect of electron-withdrawing substituents and the steric effect of bulky alkyl groups on the imino nitrogen atom markedly decrease the hydrogen-bonding basicity.
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2

Allemane, H., M. Prados-Ramirez, J. P. Croué y B. Legube. "Recherche et identification des premiers sous-produits d'oxydation de l'isoproturon par le système ozone/peroxyde d'hydrogène". Revue des sciences de l'eau 8, n.º 3 (12 de abril de 2005): 315–31. http://dx.doi.org/10.7202/705226ar.

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Une solution aqueuse tamponnée par des phosphates (pH initial - 8) dopée en isoproturon (N- (isopropyl-4-phényl)-N-N'-diméthylurée) (~ 20 mg 1-1), a été oxydée par le système perozone, combinant l'ozone et le peroxyde d'hydrogène dans un rapport molaire de 0,5 à 0,6 moles de H2O2 par mole d'ozone. Les disparitions du composé parent, du carbone organique total (COT), du carbone total (CT) et de la consommation d'ozone, ont été suivies au cours de l'oxydation. Les premiers sous-produits d'oxydation, ceux susceptibles de conserver une formulation moléculaire proche de celle du composé initial, et par conséquent de posséder encore une activité toxique, ont été isolés et caractérisés par chromatographie gazeuse couplée à la spectrométrie de masse. Il a été trouvé que l'isoproturon requiert un taux d'oxydation molaire de 10 moles d'ozone par mole d'isoproturon introduit, pour obtenir une élimination complète de cet herbicide. En revanche, le COT n'est pratiquement pas minéralisé, même avec de très forts taux d'ozone, ce qui indique la présence dans le milieu de sous-produits rémanents. La plupart des premiers sous-produits d'oxydation détectés conservent le cycle aromatique dans leur structure, et au moins un atome d'azote, et sont présents à des concentrations significatives. Ces composés semblent aussi réactifs que l'isoproturon vis-à-vis de la perozonation puisqu'ils disparaissent lorsqu'on prolonge l'oxydation. De plus, l'identification de ces sous-produits laisse supposer que l'attaque des radicaux hydroxyles générés par le procédé perozone, entraîne la rupture d'une liaison C-N ou d'une liaison C-H, conduisant à la formation de composés oxygénés.
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3

Derdour, Aïcha y Fernand Texier. "Étude cinétique de l'ouverture thermique de la liaison C—C d'aziridines et d'époxydes dipôles-1,3 potentiels: I. Méthode d'étude expérimentale". Canadian Journal of Chemistry 63, n.º 8 (1 de agosto de 1985): 2245–52. http://dx.doi.org/10.1139/v85-370.

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The thermolysis of the 2-cyanoaziridines (1), 2-alkoxycarbonylaziridines (2), 2-arylaziridines (3), and 2,2-dicyano-3-aryloxiranes (4) leads to a rupture of the carbon –carbon bond yielding an azomethine ylide and the ylide of a carbonyl. The reaction of these ylides of azomethine with methyl acetylene dicarboxylate (MADC) leads to the formation of a 3-pyroline, which is transformed, according to the substituants, to a 2-pyrroline or to pyrrole. The addition of the ylides of carbonyl leads to the formation of dihydrofurans. Through the kinetic treatment of the addition of these heterocyclic compounds (1 to 4) to MADC, it is possible to determine the rate constants for the opening of the C—C bond (k1). In the case of the aziridines 1, the rates have been determined by ir while hplc has been used in the other cases. Relative to the heterocyclic compounds, the order of the experimental rate constants (kex) is always equal to one. In the cases of theN-cyclohexyl-2-cyano-3-alkylaziridines and of the N-cyclohexyl-2-carbomethoxy-3-phenylaziridine, kex varies with the concentration of MADC and this implies that the rate constants for the cycloaddition of the ylide of azomethine and its reclosing to give aziridine are similar. In the other cases, kex is independent of the concentration of MADC and this implies that the heterocyclic compounds are slowly transformed into 1,3-dipoles, followed by a rapid cycloaddition, [Formula: see text]. [Journal translation]
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4

Top, Siden y Gérard Jaouen. "Formation de liaison CC par couplage réducteur d'ions carbéniums arène chrome tricarbonyle". Journal of Organometallic Chemistry 336, n.º 1-2 (diciembre de 1987): 143–51. http://dx.doi.org/10.1016/0022-328x(87)87164-4.

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5

Andersen, Heidi Gade, David Kvaskoff y Curt Wentrup. "Bisiminopropadienes R-N=C=C=C=N-R from Pyridopyrimidines". Australian Journal of Chemistry 65, n.º 6 (2012): 686. http://dx.doi.org/10.1071/ch12039.

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Chlorination of the N,N′-di(2-pyridyl)malonamide 13a affords 2-chloro-8-methyl-4-(2-(4-picolinyl)imino-4H-pyrido[1,2-a]pyrimidine 17a. Flash vacuum thermolysis of 17a causes efficient ring opening to the valence-tautomeric ketenimine 18a/19a, elimination of HCl, and formation of the bis(4-methyl-2-pyridyl)iminopropadiene, R-N=C=C=C=N-R 20a.
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6

Ghorai, Sujit K., Vijaya G. Gopalsamuthiram, Anup M. Jawalekar, Rupesh E. Patre y Sitaram Pal. "Iron catalyzed C N bond formation". Tetrahedron 73, n.º 14 (abril de 2017): 1769–94. http://dx.doi.org/10.1016/j.tet.2017.02.033.

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7

Neumann, Julia J., Mamta Suri y Frank Glorius. "Efficient Synthesis of Pyrazoles: Oxidative CC/NN Bond-Formation Cascade". Angewandte Chemie International Edition 49, n.º 42 (6 de septiembre de 2010): 7790–94. http://dx.doi.org/10.1002/anie.201002389.

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8

Eftaiha, Ala'a F., Abdussalam K. Qaroush, Ibrahim K. Okashah, Fatima Alsoubani, Jonas Futter, Carsten Troll, Bernhard Rieger y Khaleel I. Assaf. "CO2 activation through C–N, C–O and C–C bond formation". Physical Chemistry Chemical Physics 22, n.º 3 (2020): 1306–12. http://dx.doi.org/10.1039/c9cp05961j.

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9

Li, Wenjuan, Xiaojian Zheng y Zhiping Li. "Iron-Catalyzed CC Bond Cleavage and CN Bond Formation". Advanced Synthesis & Catalysis 355, n.º 1 (4 de enero de 2013): 181–90. http://dx.doi.org/10.1002/adsc.201200324.

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10

Guo, Wei, Mingming Zhao, Wen Tan, Lvyin Zheng, Kailiang Tao y Xiaolin Fan. "Developments towards synthesis of N-heterocycles from amidines via C–N/C–C bond formation". Organic Chemistry Frontiers 6, n.º 13 (2019): 2120–41. http://dx.doi.org/10.1039/c9qo00283a.

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11

Frey, Johanna, Sabine Choppin, Françoise Colobert y Joanna Wencel-Delord. "Towards Atropoenantiopure N–C Axially Chiral Compounds via Stereoselective C–N Bond Formation". CHIMIA International Journal for Chemistry 74, n.º 11 (25 de noviembre de 2020): 883–89. http://dx.doi.org/10.2533/chimia.2020.883.

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N–C axial chirality, although disregarded for decades, is an interesting type of chirality with appealing applications in medicinal chemistry and agrochemistry. However, atroposelective synthesis of optically pure compounds is extremely challenging and only a limited number of synthetic routes have been designed. In particular, asymmetric N-arylation reactions allowing atroposelective N–C bond forming events remain scarce, although great advances have been achieved recently. In this minireview we summarize the synthetic approaches towards synthesis of N–C axially chiral compounds via stereocontrolled N–C bond forming events. Both organo-catalyzed and metal-catalyzed transformations are described, thus illustrating the diversity and specificity of both strategies.
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12

Fletcher, Rodney J., Murat Kizil y John A. Murphy. "Novel radical-induced CN bond formation". Tetrahedron Letters 36, n.º 2 (enero de 1995): 323–26. http://dx.doi.org/10.1016/0040-4039(94)02241-3.

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13

Abellán-López, Antonio, María-Teresa Chicote, Delia Bautista y José Vicente. "From Chelate C,N-Cyclopalladated Oximes to C,N,N′-, C,N,S-, or C,N,C′-Pincer Palladium(II) Complexes by Formation of Oxime Ether Ligands". Organometallics 31, n.º 21 (11 de octubre de 2012): 7434–46. http://dx.doi.org/10.1021/om3007213.

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14

Wu, Xiao-Feng y Helfried Neumann. "Zinc-Catalyzed Organic Synthesis: CC, CN, CO Bond Formation Reactions". Advanced Synthesis & Catalysis 354, n.º 17 (12 de noviembre de 2012): 3141–60. http://dx.doi.org/10.1002/adsc.201200547.

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15

Zhu, Chen, Rui Wang y John R. Falck. "Amide‐Directed Tandem CC/CN Bond Formation through CH Activation". Chemistry – An Asian Journal 7, n.º 7 (11 de abril de 2012): 1502–14. http://dx.doi.org/10.1002/asia.201200035.

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16

Hashmi, A. Stephen K. "N-2-Phenylaziridinyl imines: Fragmentation and C-C-bond formation". Journal für praktische Chemie 341, n.º 6 (agosto de 1999): 600–604. http://dx.doi.org/10.1002/(sici)1521-3897(199908)341:6<600::aid-prac600>3.0.co;2-w.

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17

Marquis, Eric, Jérôme Graton, Michel Berthelot, Aurélien Planchat y Christian Laurence. "Liaison hydrogène des arylamines : compétition des sites π et N". Canadian Journal of Chemistry 82, n.º 9 (1 de septiembre de 2004): 1413–22. http://dx.doi.org/10.1139/v04-128.

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An IR study, in the region of OH stretching, of a reference hydrogen-bond donor, 4-fluorophenol, hydrogen bonded to primary, secondary, and tertiary arylamines differently substituted on the ring and on the nitrogen, shows the formation of two kinds of 1:1 complexes in CCl4 solution: an OH···π and an OH···N hydrogen-bonded complex. The IR method gives only access to a global complexation constant Kt. A method is proposed for separating Kt into a Kπ component for hydrogen bonding to the π system and a KN component for hydrogen bonding to the nitrogen atom. This method is validated by comparing the estimated Kπ and KN values to theoretically calculated descriptors of basicity: the nitrogen lone pair orientation towards the aromatic ring, the molecular electrostatic potentials around the nitrogen and the π cloud, and the enthalpy of hydrogen bonding of hydrogen fluoride with the π system of selected arylamines. The main electronic and steric factors governing the competition between π and N sites are analysed. The strongest π and N bases among the arylamines are julolidine and Tröger's base, respectively. Triphenylamine and diphenylamine, which are nitrogen Brønsted bases, become π bases in hydrogen bonding. Moreover, there is no correlation between the pKHB and the pKBH+ scales of basicity of arylamines. The use of the pKBH+ scale is therefore not recommended in hydrogen-bonding studies.Key words: hydrogen bonding, arylamines, pKHB scale, competition of π and N hydrogen-bonded sites.
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18

Li, Ying-Xiu, Ke-Gong Ji, Hai-Xi Wang, Shaukat Ali y Yong-Min Liang. "ChemInform Abstract: Iodine-Induced Regioselective C-C and C-N Bonds Formation of N-Protected Indoles." ChemInform 42, n.º 16 (24 de marzo de 2011): no. http://dx.doi.org/10.1002/chin.201116105.

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19

Schranck, Johannes, Anis Tlili y Matthias Beller. "More Sustainable Formation of CN and CC Bonds for the Synthesis of N-Heterocycles". Angewandte Chemie International Edition 52, n.º 30 (17 de junio de 2013): 7642–44. http://dx.doi.org/10.1002/anie.201303015.

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20

He, Qianlin, Feng Xie, Chuanjiang Xia, Wanyi Liang, Ziyin Guo, Zhongzhi Zhu, Yibiao Li y Xiuwen Chen. "Copper-Catalyzed Selective 1,2-Difunctionalization of N-Heteroaromatics through Cascade C–N/C═C/C═O Bond Formation". Organic Letters 22, n.º 20 (30 de septiembre de 2020): 7976–80. http://dx.doi.org/10.1021/acs.orglett.0c02910.

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21

Jala, Ranjith y Radha Krishna Palakodety. "Copper-catalyzed oxidative C H bond functionalization of N-allylbenzamide for C N and C C bond formation". Tetrahedron Letters 60, n.º 21 (mayo de 2019): 1437–40. http://dx.doi.org/10.1016/j.tetlet.2019.04.041.

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22

Zinser, Caroline M., Katie G. Warren, Fady Nahra, Abdullah Al-Majid, Assem Barakat, Mohammad Shahidul Islam, Steven P. Nolan y Catherine S. J. Cazin. "Palladate Precatalysts for the Formation of C–N and C–C Bonds". Organometallics 38, n.º 14 (2 de julio de 2019): 2812–17. http://dx.doi.org/10.1021/acs.organomet.9b00326.

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23

Majek, Michal y Axel Jacobi von Wangelin. "Ambient-Light-Mediated Copper-Catalyzed CC and CN Bond Formation". Angewandte Chemie International Edition 52, n.º 23 (6 de mayo de 2013): 5919–21. http://dx.doi.org/10.1002/anie.201301843.

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24

Neumann, Julia J., Mamta Suri y Frank Glorius. "ChemInform Abstract: Efficient Synthesis of Pyrazoles: Oxidative C-C/N-N Bond-Formation Cascade." ChemInform 42, n.º 6 (13 de enero de 2011): no. http://dx.doi.org/10.1002/chin.201106144.

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25

Zha, Quanwen, Qiulan Xie, Yimin Hu, Jie Han, Lingling Ge y Rong Guo. "Metallosurfactants C n –Cu–C n : vesicle formation and its drug-controlled release properties". Colloid and Polymer Science 294, n.º 5 (12 de febrero de 2016): 841–49. http://dx.doi.org/10.1007/s00396-016-3841-7.

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26

Tiritiris, Ioannis y Willi Kantlehner. "Crystal structure ofN-[3-(dimethylamino)propyl]-N′,N′,N′′,N′′-tetramethyl-N-(N,N,N′,N′-tetramethylformamidiniumyl)guanidinium bis(tetraphenylborate)". Acta Crystallographica Section E Crystallographic Communications 71, n.º 12 (1 de diciembre de 2015): o1045—o1046. http://dx.doi.org/10.1107/s2056989015023336.

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In the title salt, C15H36N62+·2C24H20B−, the three N—C bond lengths in the central C3N unit of the bisamidinium ion range between 1.388 (3) and 1.506 (3) Å, indicating single- and double-bond character. Furthermore, four C—N bonds have double-bond character. Here, the bond lengths range from 1.319 (3) to 1.333 (3) Å. Delocalization of the positive charges occurs in the N/C/N and C/N/C planes. The dihedral angle between both N/C/N planes is 70.5 (2)°. In the crystal, C—H...π interactions between H atoms of the cation and the benzene rings of both tetraphenylborate ions are present. The benzene rings form aromatic pockets, in which the bisamidinium ion is embedded. This leads to the formation of a two-dimensional supramolecular pattern along theabplane.
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27

Tsarev, Vasily N., Stanislav I. Konkin, Alexei A. Shyryaev, Vadim A. Davankov y Konstantin N. Gavrilov. "Enantioselective Pd-catalyzed C*–C, C*–N, and C*–S bond formation reactions using first P,P,N,N-tetradentate chiral phosphites". Tetrahedron: Asymmetry 16, n.º 10 (mayo de 2005): 1737–41. http://dx.doi.org/10.1016/j.tetasy.2005.04.010.

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28

Morris, Scott A., Theresa H. Nguyen y Nan Zheng. "Diastereoselective Oxidative CN/CO and CN/CN Bond Formation Tandems Initiated by Visible Light: Synthesis of FusedN-Arylindolines". Advanced Synthesis & Catalysis 357, n.º 10 (6 de julio de 2015): 2311–16. http://dx.doi.org/10.1002/adsc.201500317.

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29

Sana, Michel, Georges Leroy, Mustapha Hilali, Minh Tho Nguyen y L. G. Vanquickenborne. "Heats of formation of isomeric [C, H4, O]+, [C, H3, N]+ and [C, H5, N]+ radical cations". Chemical Physics Letters 190, n.º 6 (marzo de 1992): 551–56. http://dx.doi.org/10.1016/0009-2614(92)85190-l.

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30

Morris, Scott A., Theresa H. Nguyen y Nan Zheng. "ChemInform Abstract: Diastereoselective Oxidative C-N/C-O and C-N/C-N Bond Formation Tandems Initiated by Visible Light: Synthesis of Fused N-Arylindolines." ChemInform 46, n.º 46 (27 de octubre de 2015): no. http://dx.doi.org/10.1002/chin.201546150.

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31

Tunge, Jon A., Shelli R. Mellegaard-Waetzig y Dinesh Kumar Rayabarapu. "Allylic Amination via Decarboxylative C-N Bond Formation". Synlett, n.º 18 (2005): 2759–62. http://dx.doi.org/10.1055/s-2005-918949.

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32

Yeston, Jake. "A light approach to C-N bond formation". Science 353, n.º 6296 (14 de julio de 2016): 258.9–259. http://dx.doi.org/10.1126/science.353.6296.258-i.

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33

Mirvich, S. S. "Vitamin C inhibition of N-nitroso compound formation". American Journal of Clinical Nutrition 57, n.º 4 (1 de abril de 1993): 598–99. http://dx.doi.org/10.1093/ajcn/57.4.598.

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34

Wang, Pengfei, Wenya Lu, Dattatray Devalankar y Zhenying Ding. "Photochemical Formation and Cleavage of C–N Bond". Organic Letters 17, n.º 1 (18 de diciembre de 2014): 170–72. http://dx.doi.org/10.1021/ol503473c.

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35

Marchetti, Louis, Abhishek Kantak, Riley Davis y Brenton DeBoef. "Regioselective Gold-Catalyzed Oxidative C–N Bond Formation". Organic Letters 17, n.º 2 (24 de diciembre de 2014): 358–61. http://dx.doi.org/10.1021/ol5034805.

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36

Kärkäs, Markus D. "Electrochemical strategies for C–H functionalization and C–N bond formation". Chemical Society Reviews 47, n.º 15 (2018): 5786–865. http://dx.doi.org/10.1039/c7cs00619e.

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37

Tsang, W. C. Peter, Nan Zheng y Stephen L. Buchwald. "Combined C−H Functionalization/C−N Bond Formation Route to Carbazoles". Journal of the American Chemical Society 127, n.º 42 (octubre de 2005): 14560–61. http://dx.doi.org/10.1021/ja055353i.

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38

Rit, Raja K., Majji Shankar y Akhila K. Sahoo. "C–H imidation: a distinct perspective of C–N bond formation". Organic & Biomolecular Chemistry 15, n.º 6 (2017): 1282–93. http://dx.doi.org/10.1039/c6ob02162j.

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39

Möhlmann, Lennart, Moritz Baar, Julian Rieß, Markus Antonietti, Xinchen Wang y Siegfried Blechert. "Carbon Nitride-Catalyzed Photoredox CC Bond Formation with N-Aryltetrahydroisoquinolines". Advanced Synthesis & Catalysis 354, n.º 10 (5 de junio de 2012): 1909–13. http://dx.doi.org/10.1002/adsc.201100894.

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40

Zhang, Qian y Yan Li. "N-Fluorobenzenesulfonimide: An Efficient Nitrogen Source for C–N Bond Formation". Synthesis 47, n.º 02 (20 de noviembre de 2014): 159–74. http://dx.doi.org/10.1055/s-0034-1379396.

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41

Xie, E. Q., Y. F. Jin, Z. G. Wang y D. Y. He. "Formation of C–N compounds by N-implantation into diamond films". Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 135, n.º 1-4 (febrero de 1998): 224–28. http://dx.doi.org/10.1016/s0168-583x(97)00595-8.

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42

Dacho, Vladimír, Dária Nitrayová, Michal Šoral, Andrea Machyňáková, Ján Moncoľ y Peter Szolcsányi. "Access to N-Alkylpyrazin-2-ones via C–O to C–N Rearrangement of Pyrazinyl Ethers". SynOpen 03, n.º 04 (octubre de 2019): 108–13. http://dx.doi.org/10.1055/s-0039-1690222.

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The reaction of tosylated 2-alkoxypyrazines with potassium halides led to the unexpected formation of N-alkylated pyrazinones. Such rare example of substitutive C–O → C–N rearrangement on pyrazines was then scrutinised by using various nucleophiles to afford the respective products in moderate to good yields. This method provides a direct access to N-alkylated-1H-pyrazin-2-ones. The formation of the rearranged products is conveniently and reliably determined by characteristic NMR shifts of their heteroaromatic protons.
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43

Sun, Jiyun, Guangchen Li, Guangtao Zhang, Ying Cong, Xuechan An, Daisy Zhang-Negrerie y Yunfei Du. "Cascade Formation of C3-Unsymmetric Spirooxindoles via PhI(OAc)2-Mediated Oxidative C−C/C−N Bond Formation". Advanced Synthesis & Catalysis 360, n.º 13 (16 de mayo de 2018): 2476–81. http://dx.doi.org/10.1002/adsc.201800314.

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44

Li, Ying-Xiu, Ke-Gong Ji, Hai-Xi Wang, Shaukat Ali y Yong-Min Liang. "Iodine-Induced Regioselective C−C and C−N Bonds Formation ofN-Protected Indoles". Journal of Organic Chemistry 76, n.º 2 (21 de enero de 2011): 744–47. http://dx.doi.org/10.1021/jo1023014.

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45

Lennon, Ian C. y Ashok V. Bhatia. "SPECIAL FEATURE SECTION: Transition-Metal-Mediated C-C and C-N Bond Formation". Organic Process Research & Development 12, n.º 3 (16 de mayo de 2008): 467. http://dx.doi.org/10.1021/op800082j.

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Pratap, Ramendra, Damon Parrish, Padmaja Gunda, D. Venkataraman y Mahesh K. Lakshman. "Influence of Biaryl Phosphine Structure on C−N and C−C Bond Formation". Journal of the American Chemical Society 131, n.º 34 (2 de septiembre de 2009): 12240–49. http://dx.doi.org/10.1021/ja902679b.

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Kaur, Navjeet. "Cobalt-catalyzed C–N, C–O, C–S bond formation: synthesis of heterocycles". Journal of the Iranian Chemical Society 16, n.º 12 (6 de julio de 2019): 2525–53. http://dx.doi.org/10.1007/s13738-019-01731-1.

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Feng, Guangshou, Xiaofei Wang y Jian Jin. "Decarboxylative C-C and C-N Bond Formation by Ligand-Accelerated Iron Photocatalysis". European Journal of Organic Chemistry 2019, n.º 39 (11 de octubre de 2019): 6728–32. http://dx.doi.org/10.1002/ejoc.201901381.

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Li, Wenjuan, Xiaojian Zheng y Zhiping Li. "ChemInform Abstract: Iron-Catalyzed C-C Bond Cleavage and C-N Bond Formation." ChemInform 44, n.º 23 (16 de mayo de 2013): no. http://dx.doi.org/10.1002/chin.201323076.

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Siebeneicher, Holger y Sven Doye. "Dimethyltitanocene Cp2TiMe2: A Useful Reagent for C—C and C—N Bond Formation". Journal für praktische Chemie 342, n.º 1 (enero de 2000): 102–6. http://dx.doi.org/10.1002/(sici)1521-3897(200001)342:1<102::aid-prac102>3.0.co;2-n.

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