Vinylidene and Carbyne Complexes Derived from the Reactions of OsCl(PPh₃)(PCP) (PCP = 2,6-(PPh₂CH₂)₂C₆H₃) with Terminal Acetylenes

Abstract

Treatment of OsCl2(PPh3)3 with 1,3-(PPh2CH2)2C6H4 led to the formation of the coordinatively unsaturated complex OsCl(PPh3)(PCP) (PCP = 2,6-(PPh2CH2)2C6H3). Reactions of OsCl(PPh3)(PCP) with RC⋮CH (R = Ph, t-Bu, C(OH)Ph2) gave OsCl(CCHR)(PPh3)(PCP). Treatment of OsCl(CCHPh)(PPh3)(PCP) and OsCl(CCHC(OH)Ph2)(PPh3)(PCP) with HCl produced the carbyne complexes OsCl2(⋮CCH2Ph)(PCP) and OsCl2(⋮CCHCPh2)(PCP), respectively. The solid-state structures of OsCl(PPh3)(PCP) and OsCl(CCHPh)(PPh3)(PCP) have been determined by X-ray diffraction.