No electron-withdrawing or electron-releasing substituents are necessary for the substrates in the rhodium-catalyzed [4+2] cycloaddition reaction between a vinylallene and an ordinary alkyne under mild conditions [Eq. (1)]. The use of the strongly electron-accepting P[OCH(CF3 )2 ]3 ligand affords the optimal rhodium catalyst. cod = 1,5-cyclooctadiene.
在温和的条件下,
乙烯基丙二烯和普通
炔烃在
铑催化的[4 + 2]环加成反应中,底物不需要吸电子或释放电子的取代基。(1)]。强电子接受的P [OCH(CF 3)2 ] 3
配体的使用提供了最佳的
铑催化剂。鳕鱼= 1,5-
环辛二烯。