Formation of a Vinyliminium Palladium Complex by C−C Coupling in Vinylcarbene Palladium Aryl Complexes

Pentafluorophenyl palladium complexes 3 and 5 bearing a vinylcarbene ligand slowly decompose on
heating by migratory insertion to give Pd(0) and the vinyliminium salts (Et2NC(C6F5)CHCHPh)X
(X = Br, BF4). However, the presence of triphenylphosphine in complex 4 stabilizes 7, a compound
with a CC Pd-bound vinyliminium moiety, where there is a strong preference for the CC versus the
CN coordination.

携带有乙烯基卡宾配体的五氟苯基钯配合物3与5，在加热条件下通过迁移插入（migratory insertion）反应缓慢分解，生成零价钯（Pd(0)）与乙烯基亚胺鎓盐(Et₂N=C(C₆F₅)CH=CHPh)X（X=Br、BF₄）。不过，配合物4中的三苯基膦可稳定化合物7，该化合物带有与钯配位的C=C型乙烯基亚胺鎓基团，且相较于C=N配位，对C=C配位具有更强的选择性偏好。