Reduction of Allylpalladium(II)chloride Dimer by Formation of Allyloxysilanes
作者:Scott Denmark、Russell Smith
DOI:10.1055/s-2006-951516
日期:2006.11
The reduction ofallylpalladium(II)chloride dimer (APC) to a Pd(0) species can be effected by reaction with alkali metal silanolates. The reduction is extremely rapid in the presence of chelating bisphosphine ligands and for a variety of silanolates.
烯丙基氯化钯 (II) 二聚体 (APC) 还原为 Pd(0) 物质可以通过与碱金属硅烷醇盐反应来实现。在螯合双膦配体和各种硅烷醇化物存在的情况下,还原速度非常快。
Probing the electronic demands of transmetalation in the palladium-catalyzed cross-coupling of arylsilanolates
作者:Scott E. Denmark、Russell C. Smith、Wen-Tau T. Chang
DOI:10.1016/j.tet.2011.03.066
日期:2011.6
The electronic characteristics of coupling partners in the transmetalation step for the cross-coupling reaction of arylsilanolates have been investigated. The ability to interrogate the transmetalation event by in situ preparation of the arylpalladium(II) silanolate intermediate has enabled a Hammett analysis for both the aryl electrophile and arylsilanolate to be conducted. These studies reveal that electron-donating groups on the silicon nucleophile and electron-withdrawing groups on the electrophile accelerate the transmetalation process. (C) 2011 Elsevier Ltd. All rights reserved.