Synthesis and structures of novel zerovalent ruthenium p-quinone complexes and a bimetallic p-biquinone complex

摘要

Ru(eta(6)-cot)(eta(2)-dmfm)(2) (1; Cot = 1,3,5-cyclooctatriene, dmfm = dimethyl fumarate) reacted with p-quinones to give novel p-quinone-coordinated ruthenium(O) complexes, Ru(eta(6)-cot)(p-quinone) (2), in good to high yields via the replacement of two dimethyl famarates by p-quinones. The reaction of 1 with p-biquinone gave a novel bimetallic zerovalent complex {Ru(eta(6)-cot)}(2)(p-biquinone) (3), in which p-biquinone coordinates to two isolated "Ru(cot)" moieties with a unique mode and the two Ru(cot) groups are located at endo positions. Complexes 2 and 3 have either p-quinone or p-biquinone as pi-acceptor ligands. The structures of complexes Ru(eta(6)-cot)(2,6-dimethoxy-p-quinone) (2f) and 3 were determined by X-ray crystallography. [References: 46]