Substituent effects on the stereochemistry of substituted cyclohexanone dimethylhydrazone alkylations. An x-ray crystal structure of lithiated cyclohexanone dimethylhydrazone
作者:David B. Collum、Daniel Kahne、Sally A. Gut、Randall T. DePue、Fariborz Mohamadi、Robert A. Wanat、Jon Clardy、G. Van Duyne
DOI:10.1021/ja00329a039
日期:1984.8
Observation de hautes selectivites axiales dans les alkylations des hydrazones metalliques cyano-substituees, mais pas dans le cas de substitution alcoxycarbonyl
Observation de hautes selectivitesaxis dans les 烷基化 de hydrazones metalliques cyano-substituees, mais pas dans le cas de 取代烷氧基羰基
Sulfoxide-mediated Umpolung of alkali halide salts
new protocol for the direct two-electron oxidative Umpolung of alkali halidesalts is reported. This procedure, relying on the use of a commercially available sulfoxide as the oxidant, allows the electrophilichalogenation of carbonyl compounds as well as halolactonisation reactions to proceed from the corresponding sodium salts, at room temperature and under mild conditions.
Catalytic Asymmetric Electrochemical α‐Arylation of Cyclic β‐Ketocarbonyls with Anodic Benzyne Intermediates
作者:Longji Li、Yao Li、Niankai Fu、Long Zhang、Sanzhong Luo
DOI:10.1002/anie.202006016
日期:2020.8.17
herein is an electrochemical approach for the oxidative generation of benzynes (cyclohexyne) and its successful merging with chiral primary aminocatalysis, formulating the first catalytic asymmetric enamine–benzyne (cyclohexyne) coupling reaction. Cobalt acetate was identified to stabilize the in situ generated arynes and facilitate its coupling with an enamine. This catalytic enamine‐benzyne protocol
The development of a direct ylide transfer to carbonyl derivatives and of a sulfoxide-mediated arylation is presented from a unified perspective. Mechanistic studies (including density functional calculations) support a common reaction pathway and showcase how subtle changes in reactant properties can lead to disparate and seemingly unrelated reaction outcomes.
Disclosed is a method of repelling noxious insects comprising the step of exposing said noxious insects to a composition containing from 0.1 to 90 wt. %, based on the total weight of the composition, of at least one of 2-(1-hydroxyalkyl)cycloalkanols represented by the following formulae (9) and (10):
wherein R4 is a straight-chain or branched, saturated or unsaturated, hydrocarbon radical having 1-8 carbon atoms and R5 and R6 are hydrogens or lower alkyl groups having at most 3 carbon atoms and the sum of the carbon atoms of R5 and R6 is 0-3.