Process for the preparation of aryl substituted aldehydes, ketones and
申请人:Givaudan Corporation
公开号:US04070374A1
公开(公告)日:1978-01-24
Upon reacting an alcohol having an olefinic double bond with an aryl bromide or iodide in the presence of a Paladium catalyst, there is provided either an aryl substituted aldehyde, ketone or olefinic alcohol.
Vinyldisiloxanes: their synthesis, cross coupling and applications
作者:Hannah F. Sore、Christine M. Boehner、Luca Laraia、Patrizia Logoteta、Cora Prestinari、Matthew Scott、Katharine Williams、Warren R. J. D. Galloway、David R. Spring
DOI:10.1039/c0ob00338g
日期:——
During the studies towards the development of pentafluorophenyldimethylsilanes as a novel organosilicon cross coupling reagent it was revealed that the active silanolate and the corresponding disiloxane formed rapidly under basic conditions. The discovery that disiloxanes are in equilibrium with the silanolate led to the use of disiloxanes as cross coupling partners under fluoride free conditions. Our previous report focused on the synthesis and base induced cross coupling of aryl substituted vinyldisiloxanes with aryl halides; good yields and selectivities were achieved. As a continuation of our research, studies into the factors which influence the successful outcome of the cross coupling reaction with both alkyl and aryl substituted vinyldisiloxanes were examined and a proposed mechanism discussed. Further investigation into expanding the breadth and diversity of substituted vinyldisiloxanes in cross coupling was explored and applied to the synthesis of unsymmetrical trans-stilbenes and cyclic structures containing the trans-alkene architecture.
Hydrostannation reactions were performed cleanly using ionicliquidsupportedorganotinreagents. These green reducing agents were used both under free radical and palladium-catalyzed conditions. One of the new ionicliquidsupportedorganotinreagents so obtained was evaluated successfully in Stillecross-couplingreactions to give aryl-substituted allylic alcohols in solvent free conditions.
Reactions of vinyltributylgermanes and aryl halides under Heck conditions
作者:Nicole M. Torres、Jérôme M. Lavis、Robert E. Maleczka
DOI:10.1016/j.tetlet.2009.05.035
日期:2009.8
We describe the palladium-mediated reaction of vinyltributylgermanes with aryl halides under Heck conditions. Depending on their degree of substitution, (E)-vinyltributylgermanes preferentially afford either the cine or Z-alkenyl coupled products in moderate yields. Substituents at the allylic position, especially oxygen, impact regio- and stereoselectivity. (C) 2009 Elsevier Ltd. All rights reserved.
CHALK A. J.; MAGENNIS S. A., J. ORG. CHEM. <JOCE-AH>, 1976, 41, NO 7, 1206-1209