Preparation, characterization, and reactivity of an osmium-alkenyl dihydrogen complex

Treatment of OsCl2(PPh3)(PNP) (PNP = 2,6-(Ph2PCH2)(2)C5H3N) with LiC=CPh produced OsCl(PPh3)(2-Ph2PCH(CPh=CH)-6-Ph2PCH2C5H The structure of the latter; unusual complex has been confirmed by an X-ray diffraction study. Reaction of OsCl(PPh3)(2-Ph-2-PCH(CPh=CH)-6-Ph2PCH2C5H3N) With H-2 and K2CO3 in the presence of NaBF4 in methanol produced OsH(PPh3)(2-Ph2PCH(CPh=CH)-6-Ph2PCH2C5H3N). Protonation of OsH(PPh3)(2-Ph2PCH(CPh=CH)-6-Ph2PCH2C5H3N) with HEF4 gave [Os(H-2)(PPh3)(2-Ph2PCH(CPh-CH)-6-Ph2PCH2C5H3N)]BF4. which reacted with H-2 to give [OsH(B-2)(PPh3)(2-Ph2PCH(CPh=CH2)-6-Ph2PCH2C5H3N)]BF4