Regiospecific formation of 1,3-dienes by the palladium catalysed intra- and inter-molecular coupling of vinyl halides.1
作者:Ronald Grigg、Paul Stevenson、Tanachat Worakun
DOI:10.1016/s0040-4020(01)90347-3
日期:1988.1
Palladium acetate (5 mol %) effects catalytic inter-and intra-molecular coupling of vinyl bromides in good yield under mild conditions provided sufficient triarylphosphine and potassium carbonate are present to regenerate the active palladium(O) species. Wilkinson's catalyst is a poor catalyst for the same coupling reaction. Double bond isomerisation is not observed under these conditions. The palladium
如果存在足够的三芳基膦和碳酸钾以再生活性钯(O),则乙酸钯(5 mol%)在温和的条件下以良好的收率催化乙烯基溴的分子间和分子内偶联。威尔金森的催化剂对于相同的偶联反应而言是较差的催化剂。在这些条件下未观察到双键异构化。钯催化剂还以48%的收率将碘代苯偶合到联苯上,而威尔金森的催化剂无效。讨论了耦合过程的机理。