characterized by an X-ray crystal structure analysis. It contains an unsymmetrically bridging hexadiyne ligand and exhibits a planar-tetracoordinate carbon center that is stabilized by a three-center two-electron interaction with the two adjacent zirconocene moieties. In solution, complex 9 exhibits dynamic NMR spectra that indicate a symmetrizing exchange of the bonding situations between the two ends of
Bis(propynyl)zirconocene 1 undergoes alkynyl ligand coupling upon treatment with B(C6F5)3; the resulting (C5H5)2Zr(µ-2,4-hexadiyne)BAr3 betaine 2 reacts with benzonitrile to give a Zr/B-bridging methylenecyclopropene derivative 5 that is formed via intramolecular alkyne insertion into a Zr–C(sp2)σ bond; complex 5 was characterized by single-crystal X-ray diffraction.
在用B(C 6 F 5)3处理后,双(丙炔基)锆茂茂1经历了炔基配体偶联。所得的(C 5 H 5)2 Zr(µ-2,4-己二炔)BAr 3甜菜碱2与苄腈反应,生成Zr / B桥连亚甲基环丙烯衍生物5,该衍生物通过分子内炔烃插入Zr–C( sp 2)σ键;配合物5通过单晶X射线衍射表征。