Hypoiodous acid-catalyzed regioselective geminal addition of methanol to vinylarenes: synthesis of anti-Markovnikov methyl acetals
作者:Swamy Peraka、Naresh Mameda、Mahender Reddy Marri、Srujana Kodumuri、Durgaiah Chevella、Prabhakar Sripadi、Narender Nama
DOI:10.1039/c5ra16826k
日期:——
salt and oxone is reported. The preliminary mechanistic investigations suggest that the key factor for achieving the anti-Markovnikov regioselectivity is the semipinacol rearrangement of an iodo functionalized intermediate, which is confirmed by an isotope labeling experiment. In addition, the reaction involves the de-iodination of a co-iodo intermediate via its oxidation to hypervalent iodine species
A generalized approach for iron catalyzed chemo- and regioselective formation of anti-Markovnikov acetals from styrene derivatives
作者:Abhishek Dutta Chowdhury、Goutam Kumar Lahiri
DOI:10.1039/c2cc17889c
日期:——
in the presence of pyridine-2,6-dicarboxylic acid and PhI(OAc)(2) can efficiently catalyze the formation of chemoselective dialkyl acetals from styrene derivatives with anti-Markovnikovregioselectivity in good to high yields under mild and benign reaction conditions.
IPy2BF4-Mediated Rearrangements of 1,2-Difunctionalized Compounds and Olefins
作者:Francisco J. Fañanás、Mónica Álvarez-Pérez、Félix Rodríguez
DOI:10.1002/chem.200500070
日期:2005.10.7
Acetal derivatives are easily obtained from 1,2-difunctionalizedcompounds by a new reaction mediated by IPy2BF4 with a mechanism based on a 1,2-migration of aryl or alkyl groups. A new oxidative rearrangement reaction of olefins is also described. Moreover, when this metal-free protocol is applied to cyclic olefins, interesting ring-contraction reactions are observed. The new methodologies described
Effective Au(<scp>iii</scp>)–CuCl<sub>2</sub>-catalyzed addition of alcohols to alkenes
作者:Xin Zhang、Avelino Corma
DOI:10.1039/b706961h
日期:——
Alkenes can be activated by Au(III) catalysts, and the effective addition of alcohols to alkenes can be carried out under mild conditions with Au(III), provided that catalytic amounts of CuCl(2) are added, which significantly stabilize the cationic Au(III).
On the Mechanism and Substituent Effects of the Tl(III) Oxidation of Phenylethylenes in Methanol
作者:L. Nadon、M. Tardat、M. Zador、S. Fliszar
DOI:10.1139/v73-355
日期:1973.7.15
determining step, are discussed in terms of the mechanism of reaction and show the role of the coordination of Tl(III). Hammett's relationship, with ρ = −4.2, describes the substituenteffects for the competitive oxidation of ring-substituted styrenes and α-methylstyrenes. The relative migratory aptitudes of aryl groups, as determined from the oxidation products of ring-substituted 1,1-diphenylethylenes