Synthesis, structure and reactivity studies of triosmium complexes, Os 3(CO) 10(μ-Br)(CHCHPh) and Os 3(CO) 9(μ-H)(μ-Br)(CCHPh)

Abstract

Reaction of H 2Os 3(CO) 10 with PhCCBr produced a vinyltriosmium complex Os 3(CO) 10(μ-Br)(CHCHPh) ( 1) in high yield. Thermolysis of complex 1 in refluxing toluene produced a hydrido-vinylidene complex Os 3(CO) 9(μ-H)(μ-Br)(CCHPh) ( 2); the crystal structure and reactivity of complexes 1 and 2 have been studied. Crystal data for complex 1: space group P2 1 c , a 14.049(6), b 10.035(4), c 15.933(6) Å, β 93.06(4)°, Z = 4; R F 6.32%, R w 6.33%, GOF = 1.49. Crystal data for complex 2: space group P 1 n , a 14.047(4), b 10.439(3), c 15.636(4) Å, β 114.28(3)°, Z = 4; R F 3.80%, R w 4.38%, GOF = 0.73.