Reaction of a (π-Vinylcarbene)iron Complex with Tricarbonyl(η⁴-1,5-cyclooctadiene)ruthenium. Preparation, Structure, and Reactivity of Novel (μ-Vinylcarbene)(Fe−Ru) Complexes

Abstract

[1−3-η-1-Methoxy-anti-2,3-bis(methoxycarbonyl)prop-2-en-1-ylidene]tricarbonyliron (5) reacts with Ru(CO)3(COD) to give a heterobinuclear vinylcarbene complex, [μ-(1-methoxy-anti-2-(methoxycarbonyl)-μ-3-(methoxycarbonyl)-1−3-η-prop-2-en-1-ylidene)]hexacarbonyl(Fe−Ru) (7) in 78% yield. The complex 7 reacts with triphenylphosphine to give a substituted complex, [μ-(1-methoxy-anti-2-(methoxycarbonyl)-μ-3-(methoxycarbonyl)-1−3-η-prop-2-en-1-ylidene)(triphenylphosphine)]pentacarbonyl(Fe−Ru) (8) in 52% yield. The carbonyl group on ruthenium trans to the iron atom in 7 was substituted by the phosphine.