Preparation of Hydride-Ethylene Complexes of Osmium

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.

Ethylene complexes [OsH(eta(2)-CH2=CH2)L-4] 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(eta(2)-CH2=CH2){PPh(OEt)(2)}(4)] OTf was prepared by allowing the dinitrogen derivative [OsH(N-2){PPh(OEt)(2)}(4)] OTf to react with ethylene. Acrylo-nitrile CH2=C(H) CN reacts with OsH(OTf)L-4 [L = P(OEt)(3)] to give the complex [OsH{kappa(1)-NCC(H)=CH2}{P(OEt)(3)}(4)]BPh4 (3). The complexes were characterized spectroscopically (IR and H-1, C-13, P-31 NMR) and by X-ray crystal structure determination of the [OsH(eta(2)-CH2=CH2){PPh(OEt)(2)}(4)]BPh4 derivative.