Stoichiometric carbon–carbon bond formation mediated by well defined Nb(III) complexes
作者:Thomas L. Gianetti、Robert G. Bergman、John Arnold
DOI:10.1016/j.poly.2014.05.031
日期:2014.12
Nb-mediated double coupling of terminal alkynes and carbonmonoxide is reported. The Nb(III) complex (BDI)Nb(NtBu)(CO)2 reacts with two equivalents of t-butylacetylene to form a metal-bound yne-one-ene moiety resulting fromcoupling of CO to two equivalents of the terminal alkyne. Additionally, Z-alkene and α,β-unsaturated imine formation from hydrogenolysis of an internal alkyne bound complex in the presence
报道了Nb介导的末端炔烃和一氧化碳双偶联的发现。Nb(III)络合物(BDI)Nb(N t Bu)(CO)2与两当量的叔丁基乙炔反应形成金属结合的炔一烯部分,这是由于CO与两当量的末端偶联而产生的炔烃。另外,描述了在异氰化物配体存在下由内部炔烃键合的配合物的氢解形成的Z-烯烃和α,β-不饱和亚胺。1 H NMR光谱法和溴化物类似物的合成支持了烯基亚胺基配体中间体的参与。