Abstract
The reaction of Ru(acac) 3 in ethanol in the presence of dienes (diene = 2,5-dimethyl-2,4-hexadiene, isoprene, 1,2,4,5-tetramethyl-1,4-cyclohexadiene) with zinc as reducing agent affords Ru(acac) 2(diene) complexes. For the acyclic diene ligands, the Ru(acac) 2 unit exhibits a preference for the trans-diene coordination. The structures for the 2,5-dimethyl-1,3-hexadiene and 1,2,4,5-tetramethyl-1,4-cyclohexadiene derivatives have been determined crystallographically. The Ru(acac) 2(hexadiene) complex crystallizes in the monoclinic space group P2 1/ n with a = 10.658(2) A ̊ , b = 12.075(3) A ̊ , c = 15.332(3) A ̊ and β = 108.07(5)° for Z = 4 . The cyclohexadiene complex crystallizes in a triclinic space group P I , with a = 8.495(4) A ̊ , b = 8.456(4) A ̊ , c = 14.364(6) A ̊ , and α = 78.88(2)°, β = 82.60(2)°, γ = 78.04(2)° for Z = 2 . The solid-state structure for the dimethylhexadiene complex revealed an η 4- trans-diene coordination, while for the cyclic diene it revealed isolated olefin interactions.
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