Room-Temperature Z-Selective Homocoupling of α-Olefins by Tungsten Catalysts

3,5-Dimethylphenylimido complexes of tungsten can be prepared using procedures analogous to those employed for other tungsten catalysts, as can bispyrrolide species and MonoAryloxide-Pyrrolide (MAP) species. Homocouplings of 1-hexene, 1-octene, and methyl 10-undecenoate are achieved in 45−89% yield and a Z selectivity of >99% with W(NAr′′)(C3H6)(pyr)(OHIPT) as a catalyst. Homocoupling of terminal olefins in the presence of (E)-olefins elsewhere in the molecule also was achieved with excellent selectivity.钨的3,5-二甲基苯亚胺基配合物，可采用与制备其他钨基催化剂相类似的方法合成；双吡咯配体配合物及单芳氧基-吡咯配体（MonoAryloxide-Pyrrolide, MAP）类物种亦可通过此类路径制备。以W(NAr′′)(C₃H₆)(pyr)(OHIPT)为催化剂，可实现1-己烯、1-辛烯与10-十一烯酸甲酯的均偶联反应，反应产率介于45%至89%之间，Z选择性大于99%。当分子内其他位点存在(E)-型烯烃时，末端烯烃的均偶联反应同样可顺利进行，并展现出优异的反应选择性。