Using secondary alpha deuterium kinetic isotope effects to determine the stereochemistry of an E2 reaction; the stereochemistry of the E2 reaction of 1-chloro-2-phenylethane with potassium <i>tert</i>-butoxide in <i>tert</i>-butyl alcohol
作者:Peter James Smith、David AJ Crowe、Kenneth Charles Westaway
DOI:10.1139/v01-086
日期:2001.7.1
Isotopic labelling studies have shown that the E2 reaction of 1-chloro-2-phenylethane with potassium tert-butoxide in tert-butyl alcohol occurs via an anti-periplanar stereochemistry. This demonstrates that the different secondary alpha deuterium kinetic isotopeeffects found for the high and low base concentrations and in the presence of 18-crown-6 ether are because of changes in transition state
CATALYTIC ANTI-MARKOVNIKOV OXIDATION AND HYDRATION OF OLEFINS
申请人:Dong Guangbin
公开号:US20120172634A1
公开(公告)日:2012-07-05
The disclosure provides a dual-catalysis system for direct conversion of olefins to alcohols. The cooperative catalytic system contains one oxidizing catalyst and one transfer-hydrogenation catalyst. A wide variety of olefins, including aromatic and aliphatic olefins, can be used as the reactant. The transformation proceeds with anti-Markovnikov selectivity, and in some aspects provides primary alcohols as major products. The disclosure further provides a system for oxidation of olefins with anti-Markovnikov selectivity.
Enzyme‐Catalyzed Meinwald Rearrangement with an Unusual Regioselective and Stereospecific 1,2‐Methyl Shift
作者:Ruipu Xin、Willy W. L. See、Hui Yun、Xirui Li、Zhi Li
DOI:10.1002/anie.202204889
日期:2022.7.11
A highly regioselective and stereospecific enzyme-catalyzed Meinwald rearrangement of internal and cyclic epoxides through a 1,2-methyl shift gave aldehydes or ketones as the sole product with enantio-retention. The unique isomerization was incorporated into enantioselective cascades, providing novel access to chiral alcohols, acids and amines from readily available trans-β-methylstyrenes.