ChemInform Abstract: Acyclic 1,2-Induction in Radical Reactions: The Importance of Allylic Strain Effects.doi:10.1002/chin.199204085intermediates (and their reactions)stereochemistry (general, optical resolution)reactions of organo-metal compoundsChemInform is a weekly Abstracting Service, delivering concise ...
Steric interference in allylic and pseudo-allylic systems: A (1,2) strain between methyl group and hydrogen 喜欢 0 阅读量: 27 作者:SK Malhotra,DF Moakley,F Johnson 摘要: No abstract available DOI: 10.1039/c19670000448 被引量: 15 年份: 1967 ...
librariesinwhichthepres- enceorabsenceof1,3-allylicstrain(A 1,3 strain) [3] isleveraged toenhanceboth1)scaffolddiversitybyregiodivergentopen- ingofepoxideintermediatesand2)theconformationalspace ofthefinallibrarythroughthesimpleexpedientofchanging thenatureofnitrogensubstitution. [4] Theconceptisillus- trate...
(1993), ChemInform Abstract: Z-3-Methyl-3-penten-2-ol as Stereochemical Probe for 1,2- versus 1,3 Allylic Strain in the Photooxygenation and Epoxidation of Chiral Allylic Alcohols. ChemInform, 24: no. doi: 10.1002/chin.199324071 Author Information Inst. Org. Chem., Univ., W-8700 ...
ESR Experiments and AM1 calculations of ester substituted radicals show that acyclic radicals 3a,b exist in preferred conformations I and II . The stereoselectivity of the hydrogen abstraction can be explained by the attack anti to the Bu t group of conformers I and II , respectively....
This result is rationalized in terms of the minimization of allylic strain in the course of the reduction, enables the preparation of the carbasugar pseudo-2-deoxy-伪-D-glucopyranose, and suggests that the conformation of the side chain is an important control element in the chemistry of the ...
LushingtonJustin DouglasAngewandte ChemieCoombs, T. C.; Lushington, G. H.; Douglas, J.; Aube, J. 1,3-Allylic strain as a strategic diversification element for constructing libraries of substituted 2- arylpiperidines. Angew. Chem. Int. Ed. 50, 2734-2737 (2011)....
Highly like-selective [4+2] cycloadditions of chiral dienols: The importance of 1,3-allylic strain in the hydroxy-directed stereocontrol. J. Am. Chem. Soc. 1995, 117, 9190-9193; b) Roush, W. R.; Kageyama, M.; Riva, R.; Brown, B. B.; Warmus, J. S.; Moriarty, K. J. ...
The stereoselectivity of hydrogen abstraction by ester-substituted radical 1 [XCH(R 2)C???-(R 1)CO 2R] is explained by allylic strain effects. The ratio of THREO:ERYTHRO products 2:3 depends upon the size of substituents X and R 2.doi...
Allylic strain caused by N -substituents shifts strongly the a,ee, a equilibria in trans -4,6-diphenyl- and cis -4,5-diphenyl-oxazinones, but only moderately the e,ea,a equilibria in the compounds with trans -vicinal phenyl groups. In the latter, the diaxial conformation is preferred ...