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Bibliographies thématiques / ALICYCLIC SYSTEMS

Littérature scientifique sur le sujet « ALICYCLIC SYSTEMS »

Auteur : Grafiati

Publié le 18 mai 2024

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Articles de revues sur le sujet "ALICYCLIC SYSTEMS"

1

EWING, D. F. « ChemInform Abstract : Large Alicyclic Ring Systems ». ChemInform 26, n^o 3 (18 août 2010) : no. http://dx.doi.org/10.1002/chin.199503280.

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Zhubanov, B. A., V. D. Kravtsova, R. F. Mukhamedova et K. Kh Bekmagambetova. « New polymer systems based on alicyclic polyimides ». Russian Journal of Applied Chemistry 79, n^o 11 (novembre 2006) : 1869–74. http://dx.doi.org/10.1134/s1070427206110255.

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Kappe, Thomas, Barbara Schnell, Krassimira Georgieva, Brigitte Jocham, Anna E. Mayrhofer, Bhagwan P. Nikam, Yvette Issac et Klaus Langhans. « Sulfidation of Alicyclic and Heterocyclic 1,3-Dicarbonyl Systems ». Phosphorus, Sulfur, and Silicon and the Related Elements 95, n^o 1-4 (octobre 1994) : 349–50. http://dx.doi.org/10.1080/10426509408034233.

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Oszczapowicz, Janusz, et Irena Oszczapowicz. « Substituent effects in13C NMR spectra. Part II-Alicyclic rigid systems ». Journal of Physical Organic Chemistry 18, n^o 8 (24 mai 2005) : 818–24. http://dx.doi.org/10.1002/poc.946.

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Mączka, Wanda Krystyna, et Agnieszka Mironowicz. « Biotransformation of Isoprenoids and Shikimic Acid Derivatives by a Vegetable Enzymatic System ». Zeitschrift für Naturforschung C 59, n^o 3-4 (1 avril 2004) : 201–4. http://dx.doi.org/10.1515/znc-2004-3-413.

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In biotransformations carried out under similar conditions enzymatic systems from carrot (Daucus carota L.), celeriac (Apium graveolens L. var. rapaceum) and horse-radish (Armoracia lapathifolia Gilib.) hydrolyzed the ester bonds of acetates of phenols or alicyclic alcohols. Nevertheless, methyl esters of aromatic acids did not undergo hydrolysis. Alcohols were oxidized to ketones in a reversible reaction.

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Werstiuk, Nick Henry, Gwen Irene Wade et Peter John Joseph Martin. « Facile H–D exchange of the bridgehead methyls of bicyclo[2.2.2]octan-2,5-diones. Evidence for a carbon analogue of the acyloin rearrangement ». Canadian Journal of Chemistry 63, n^o 9 (1 septembre 1985) : 2582–83. http://dx.doi.org/10.1139/v85-428.

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Hexamethyltwistyl-2,5-dione 4 has been synthesized and its H–D exchange studied in t-BuOK/t-BuOD at 125 °C. We find that the bridgehead methyl at C-3 undergoes exchange 7 × 105 times faster than the bridgehead methyl of bicyclo[2.2.1]heptan-2-one (fenchone). This result, along with a previous study, establishes the first examples of the carbon analogue of the acyloin rearrangement of alicyclic systems.

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Bishop, R., et GH Lee. « Detection of Non-Conjugative Interactions in Rigid Cyclic Molecules by Using Carbon-13 N.M.R. Shift Values ». Australian Journal of Chemistry 40, n^o 2 (1987) : 249. http://dx.doi.org/10.1071/ch9870249.

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In previous work, interaction between formally unconjugated unsaturated groups was detected by comparing the 13C n.m.r. shift values of the sp2 atoms of difunctional compounds with those of the corresponding monofunctional compounds. This procedure has now been used to investigate possible interactive effects in a range of rigid alicyclic systems where steric and conformational factors cannot be involved, namely, the 2,6-disubstituted adamantane (6), 4,8-disubstituted 2-thiaadamantane (7), 2,6-disubstituted noradamantane (8), and 2,5-disubstituted norbornane (9) systems. In each case interaction was detected between the unsaturated groups of the non-conjugated dimethylene, methylene ketone, and diketone derivatives of these ring systems. The nature of this effect is under further investigation.

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Umerzakova, М. B., R. B. Sarieva et V. D. Kravtsova. « MODIFIED WITH VARIOUS ADDITIVES ARYLALYCLIC COPOLYIMIDES AND COMPOSITE FILMS BASED ON THEIR BASIS ». Chemical Journal of Kazakhstan 3 (30 septembre 2021) : 19–35. http://dx.doi.org/10.51580/2021-1/2710-1185.36.

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lopment of arylalicyclic copolyimides based on alicyclic dianhydride, aromatic dianhydrides of benzophenone- and diphenyloxidetetracarboxylic acids with 4,4'-diaminodiphenyl oxide at various ratios of alicyclic and aromatic dianhydrides, as well as various compositions based on these copolymers with low- or other high-molecular compounds that enhance the characteristics of the polymer matrix. Composite films were formed from solutions of the obtained polymer mixtures, and their properties were studied. It was noted that at optimal ratio of components, the films have improved thermal and strength properties, etc., exceeding the analogous properties of the initial arylalicyclic copolymer, while the elasticity has acceptable values for such material. The best characteristics had the composite films formed from a ternary composition of copo-lyimide-polyethylene glycol-alkylated montmorillonite. Metal-containing composite films, along with higher thermal stability compared to unmodified copolyimide, were resistant to aggressive reagents, lower values of specific volume and surface resistance, higher viscosity values, and different colors depending on the nature of the salt. By introducing a silicon-containing compound into the copolyimide solution, the new polymer systems have been obtained, and the porous films could be formed.

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9

Charton, Marvin. « The Nature and Transmission of Substituent Electrical Effects in Alicyclic Solvolysis ». Collection of Czechoslovak Chemical Communications 64, n^o 11 (1999) : 1849–76. http://dx.doi.org/10.1135/cccc19991849.

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The correlation of rate constants taken from the literature for 2-exo- and 2-endo-norbornyl derivatives substituted in positions 1, 4, 5-exo, 6-exo, 6-endo, and 7-anti with the triparametric LDR equation and relationships derived from it has been carried out. A delocalized (resonance) electrical effect has been found in all but the 4-substituted derivatives. The resonance effect may be somewhat greater when the leaving group is exo than when it is endo. Steric effects occur in the 6-endo-substituted derivatives. The transition state resembles a classical carbocation rather than the nonclassical norbornyl carbocation. The correlation of solvolysis rate constants for 2- and 3-substituted 1- and 4-exo-substituted 2-exo-adamantyl derivatives gave no reliable indication that a delocalized electrical effect existed in these systems. A study of solvolysis rate constants for 4-substituted 1-[2.2.2]bicyclooctanyl, 6-exo-substituted [2.2.2]bicyclooctan-2-exo-yl and 6-exo-substituted [2.2.2]bicyclo- octan-2-endo-yl derivatives showed a delocalized electrical effect only in the latter of these systems. Such an effect was also observed in 4-substituted 2-chloro-2-methylbutane solvolyses. The transmission of electrical effects is by a modified field effect. It is dependent on 1/n where n is the number of bonds intervening between substituent and reaction site.

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Mahesh, V. K., Mamta Maheswari, Rakesh Sharma et Rashmi Sharma. « Analogs of cannabinoids : synthesis of some 7H-indolo-, 5H-imidazolo, 7H-benzimidazolo[1,2-c] [1,3]benzoxazines – novel ring systems ». Canadian Journal of Chemistry 63, n^o 3 (1 mars 1985) : 632–35. http://dx.doi.org/10.1139/v85-103.

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Tetrahydrocannabinol 1, the active constituent of CannabissativaLinn, is a well-known CNS-active compound and introduction of a nitrogen atom at the ring junction of the pyran and alicyclic ring is of considerable interest. This prompted the synthesis of 7H-indolo[1,2-c] [1,3]-, 5H-imidazolo[1,2-C] [1,3],- and 7H-benzimidazolo[1,2-c] [1,3]-benzoxazine, a novel heterocyclic system. 2-(2′-Hydroxyphenyl) indoles, 2-(2′-hydroxyphenyl) imidazoles, and 2-(2′-hydroxyphenyl) benzimidazoles are suitable intermediates for the preparation of this type of benzoxazines, as the second heterocycle (ring B) can then be constructed by introduction of a methylene bridge between the hydroxyl of the 2′-hydroxy phenyl substituent and the imino group of the heterocyclic system.

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Thèses sur le sujet "ALICYCLIC SYSTEMS"

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Murthi(Bhaumik), Mango. « Studies in alicyclic systems ». Thesis, University of North Bengal, 1986. http://hdl.handle.net/123456789/821.

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O'Connell, M. J. « Structural studies in alicyclic systems ». Thesis, University of Canterbury. Chemistry, 1987. http://hdl.handle.net/10092/7252.

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The crystal structures of exo- (22) and endo- (23) adducts of tetracyclone and cyclopentadiene have been determined and the relative orientations of the four phenyl rings shown to be similar in the two structures. The reactions between hemicyclone and a number of substituted benzoquinones gave a series of Diels-Alder adducts. Photolysis of the adducts gave derivatives of (21) and/or (29) other reactions of the parent compound with various reagents were studied. The X-ray crystal structures of oxetane (29) and cyanohydrin (55) were determined. The reactions of the diene (37) with twenty-two dienophiles have been studied and the stereochemistry of the products have been determined by crystallographic or spectroscopic means. With olefinic dienophiles reaction occurs exclusively by attack on the carbonyl-bearing face of the diene component of (37), whilst other dienophiles (benzyne, azo compounds and acetylenes) exhibit mixed π-facial selectivity. The origin of the mixed stereoselectivities is discussed. The X-ray crystal structures of the diene (62) and four Diels-Alder adducts (87), (90), (101) and (102) are discussed. The Diels-Alder reactions between cyclopentadiene and a number of substituted benzoquinones gave a series of adducts. Reduction of these adducts and reactionwith organometallic reagents were investigated. One- and two-dimensional n.m.r. analyses of selected products are discussed.

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Chapitres de livres sur le sujet "ALICYCLIC SYSTEMS"

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Whitesell, James K., et Mark A. Minton. « Mono- and Bicyclic Systems ». Dans Stereochemical Analysis of Alicyclic Compounds by C-13 NMR Spectroscopy, 11–35. Dordrecht : Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-009-3161-9_3.

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Okoroanyanwu, Uzodinma, Jeffrey D. Byers, Ti Cao, Stephen E. Webber et C. Grant Willson. « Deprotection Kinetics of Alicyclic Polymer Resist Systems Designed for ArF (193 nm) Lithography ». Dans ACS Symposium Series, 174–90. Washington, DC : American Chemical Society, 1998. http://dx.doi.org/10.1021/bk-1998-0706.ch014.

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Grossel, Martin. « Polycyclic systems ». Dans Alicyclic Chemistry. Oxford University Press, 1997. http://dx.doi.org/10.1093/hesc/9780198501046.003.0005.

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This chapter refers to bi- and polycyclic hydrocarbons that are named according to the way in which the component rings are fused to each other. It describes heptane, also known as norbornane, as one of the best studies bicyclic systems. It also discusses the derivatives of the hydrocarbon, which have several interesting properties that partly arise from strain present in the structure and provide a useful framework for testing aspects of reactivity and mechanistic pathways. The chapter highlights features of the reactions of 2-norbornyl derivatives, which includes the occurrence of skeletal rearrangement in which the 2-norbornylcation is an intermediate. It analyses the basis of Bredt's rule, which implies that an elimination process in a bridged structure should always avoid the formation of an alkene at a bridgehead.

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Ewing, D. F. « Large alicyclic ring systems ». Dans Second Supplements to the 2nd Edition of Rodd's Chemistry of Carbon Compounds, 141–79. Elsevier, 1991. http://dx.doi.org/10.1016/b978-044453347-0.50076-8.

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Grossel, Martin. « Introduction ». Dans Alicyclic Chemistry. Oxford University Press, 1997. http://dx.doi.org/10.1093/hesc/9780198501046.003.0001.

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This chapter describes alicyclic chemistry as the chemistry of organic compounds which contain one or more non-benzenoid rings, focusing on saturated and unsaturated carbocyclic ring structures and heterocyclic systems. It highlights the major role alicyclic chemistry plays in organic chemistry as several natural products exploit saturated or partially unsaturated rings as a structural framework in terpenoid derivatives. It also mentions small cyclic terpene derivatives. These provide scents in the plant kingdom and large carbolic ring derivatives. These are found in pheromones and are important to the perfume industry. The chapter talks about large macrocyclic structures which contain several heteroatoms due to their selective abilities on complex metal and other ions.

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« Carbacyclic Metabolites : Alicyclic and Aromatic Rings in Chemical Biology ». Dans The Chemical Biology of Carbon, 226–64. The Royal Society of Chemistry, 2023. http://dx.doi.org/10.1039/bk9781839169502-00226.

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Much of the chemistry of life depends on carbacyclic organic metabolites, from three carbons (cyclopropanes) to eight carbons (cyclooctanes). The predominant aromatic carbacycle in biology is the phenyl ring system, either as a standalone ring or fused in naphthalene and more extensive fused polycyclic scaffolds. The primary route to benzene rings is from carbohydrates through shikimate, chorismate, and prephenate intermediates, with a key late stage 3,3-sigmatropic rearrangement. Two major types of fused carbacyclic systems arise by either poylketonic-S-enzymes intermediates as in tetracycline assembly, or via carbocation-mediated cyclizations to tetracyclic and pentacyclic hopane, lanosterol, and amyrin frameworks.

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BARTON, D. H. R., F. MCCAPRA, P. J. MAY et F. THUDIUM. « Long-range Effects in Alicyclic Systems. : Part III. The Relative Rates of Condensation of Some Steroid and Triterpenoid Ketones with Benzaldehyde. » Dans World Scientific Series in 20th Century Chemistry, 83–91. WORLD SCIENTIFIC / IMPERIAL COLLEGE PRESS, 1996. http://dx.doi.org/10.1142/9789812795984_0012.

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Actes de conférences sur le sujet "ALICYCLIC SYSTEMS"

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Somervell, Mark H., David S. Fryer, Brian Osborn, Kyle Patterson, Sungseo Cho, Jeff D. Byers et C. Grant Willson. « Using alicyclic polymers in top surface imaging systems to reduce line-edge roughness ». Dans Microlithography 2000, sous la direction de Francis M. Houlihan. SPIE, 2000. http://dx.doi.org/10.1117/12.388311.

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Padmanaban, Munirathna, Michelle M. Cook, Dana L. Durham, Dinesh N. Khanna, Axel Klauck-Jacobs, Joseph E. Oberlander, M. D. Rahman et Ralph R. Dammel. « Performance of 193-nm resists based on alicyclic methacrylate and cyclo-olefin systems ». Dans Microelectronic Manufacturing Technologies, sous la direction de Chris A. Mack et Tom Stevenson. SPIE, 1999. http://dx.doi.org/10.1117/12.346883.

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Park, Joo Hyeon, Seong-Ju Kim, Sun-Yi Park, Hosull Lee, Jae Chang Jung, Cheol-Kyu Bok et Ki-Ho Baik. « ArF photoresist system using alicyclic polymer ». Dans Microlithography '97, sous la direction de Regine G. Tarascon-Auriol. SPIE, 1997. http://dx.doi.org/10.1117/12.275850.

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