“Head-to-head” dimerization and dehydrodimerization of vinyl ketones catalyzed by modified rhodium(I) complexes
作者:I.P. Kovalev、Yu.N. Kolmogorov、Yu.A. Strelenko、A.V. Ignatenko、M.G. Vinogradov、G.I. Nikishin
DOI:10.1016/0022-328x(91)86452-v
日期:1991.11
The dimerization of vinyl ketones RC(O)CHCH2, I (R = Me, tBu, Ph, p-MeC6H4, cyclopropyl, 2-(5-methylfuryl)) at 80°C in the presence of the catalytic system [RhCl(C2H4)2]2MCl2 leads preferably to either α, β-unsaturated 1,6-diketones RC(O)CHCHCH2CH2C(O)R, II when M = Ge or to diene 1,6-diketones RC(O)CHCHCHCHC(O)R, III when M = Sn. The yields of II and III are 20–85% to converted I, the conversion
乙烯基酮RC(O)CH = CH 2,I(R = Me,t Bu,Ph,p- MeC 6 H 4,环丙基,2-(5-甲基呋喃基))在80°C下的二聚反应催化体系[的RhCl(C 2 H ^ 4)2 ] 2 MCl 2根引线优选要么α,β不饱和-1,6-二酮类RC(O)CHCHCH 2 CH 2 C(O)R,II当M = Ge或当M = Sn时为二烯1,6-二酮RC(O)CH = CHCH = CHC(O)R,III。II和III的产率为转化I的20-85%,乙烯基酮的转化为10-50%。中间铑和rhodiumtin复合物,包括η 2已分离并通过1 H,119 Sn NMR和IR光谱表征了配位的甲基乙烯基酮。