Pd(1,4-bis(diisopropylphosphino)butane)2 、 氯苯 以
not given 为溶剂,
生成 trans-Pd(1,4-bis(diisopropylphosphino)butane)2 (Ph)Cl 、 cis-Pd(1,4-bis(diisopropylphosphino)butane)(Ph)Cl
参考文献:
名称:
Palladium-catalyzed vinylation of aryl chlorides. Chelate effect in catalysis
摘要:
By use of the dippb ligand (dippb = 1,4-bis-(diisopropylphosphino)butane) it is possible to effect the synthetically useful Pd-catalyzed direct vinylation of aryl chlorides; the reaction tolerates various substituents and generally results in high yields. The reaction is very sensitive to the nature of the chelating ligand, probably as a result of the need for chelate opening to allow olefin coordination and chelate closure to promote insertion. Monophosphines are ineffective. A mechanistic scheme is presented.