Reaction of cationic cyclobutadineruthenium complexes with hydride anion donors; evidence for the formation of η4(5e) butadienyl species and fragmentation of the cyclobutadiene ring: crystal structure of [RuC(Ph)–η3-{C(Ph)·CH(Ph)·CH(Ph)}-(η-C5H5)] and [Ru2(µ-CO){µ-(Z)-C(Ph)CH(Ph)}(CO)2(η4-C4Ph4)(η-C5H5)]

Abstract

Reaction of ·[Ru(NCMe)(η⁴-C₄Ph₄)(η-C₅H₅)][BF₄] with K[BHBu^s₃] affords the η⁴(5e) butadienyl complex [RuC(Ph)-η³-{C(Ph)·CH(Ph)·CH(Ph)}-(η-C₅H₅)], whereas a similar reaction with [Ru(CO)(η⁴-C₄Ph₄)(η-C₅H₅)][BF₄] affords [RuC(Ph)-η³-{C(Ph)·CH(Ph)·CH(Ph)CHO}-(η-C₅H₅)] and the µ-vinyl complex [Ru₂(µ-CO){µ-(Z)-C(Ph)CH(Ph)}(CO)₂(η⁴-C₄Ph₄)(η-C₅H₅)].