Preparation of Hydride‐Ethylene Complexes of Osmium

Abstract

Abstract Ethylene complexes [OsH(η2‐CH2=CH2)L4]Y (1, 2) [L = PPh(OEt)2, P(OEt)3; Y = OTf, BPh4] were prepared by reacting the dihydride OsH2L4 first with methyl triflate CH3OTf and then with ethylene (1 atm). Alternatively, the compound [OsH(η2‐CH2=CH2){PPh(OEt)2}4]OTf was prepared by allowing the dinitrogen derivative [OsH(N2){PPh(OEt)2}4]OTf to react with ethylene. Acrylonitrile CH2=C(H)CN reacts with OsH(OTf)L4 [L = P(OEt)3] to give the complex [OsH{κ1‐NCC(H)=CH2}{P(OEt)3}4]BPh4 (3). The complexes were characterized spectroscopically (IR and 1H, 13C, 31P NMR) and by X‐ray crystal structure determination of the [OsH(η2‐CH2=CH2){PPh(OEt)2}4]BPh4 derivative.