Synthesis of Vinylnickel and Nickelacyclopropane Complexes Containing a Chelate [P,Se]-Ligand

The reaction of 2-(diphenylphosphanyl)benzeneselenol with Ni(PMe3)4 yielded the hydridonickel(II) complex [Ph2P(C6H4)Se]NiH(PMe3)2 (1). The insertion reactions of 1 with alkynes have been investigated. The vinylnickel complexes [Ph2P(C6H4)Se]Ni(CPh=CH2)(PMe3) (2) and [Ph2P(C6H4)Se]Ni(CCH3=CHPh)(PMe3) (3) were obtained by reacting phenylacetylene and 1-phenyl-1-propyne with 1. The nickelacyclopropane complexes [Ph2P(C6H4)Se]Ni[Ph(PMe3)C–CHPh] (4), [Ph2P(C6H4)Se]Ni[(SiMe3)(PMe3)C–CH2] (5) and 6 (6A and 6B) containing an ylidic ligand were obtained by reacting diphenylacetylene, (trimethylsilyl)acetylene, and 1-phenyl-2-(trimethylsilyl)acetylene with 1. The molecular structures of 1–5 were determined by single-crystal X-ray diffraction.