Remarkable reactions of cationic carbyne complexes of manganese, rhenium, and diiron with carbonylmetal anions

Abstract

The cationic carbyne complexes of manganese and rhenium, [η 5-C 5H 5(CO) 2MnCPh]BBr 4 ( 1) and [η 5-C 5H 5(CO) 2ReCPh]BBr 4 ( 2), are the entry points for the synthesis of a variety of di- or tri-metal bridging carbene and bridging carbyne complexes resulting from nucleophilic attack on the carbyne carbon. Both cationic complexes, 1 and 2, undergo a wide range of reactions with carbonylmetal mono- and di-anions, mixed-dimetal carbonyl anions, and reactive salts. Analogous studies of diiron cationic carbyne complexes [Fe 2(μ-CO)(μ-CAr)(CO) 2(η 5-C 5H 5) 2]BBr 4 (Ar=C 6H 5, p-MeC 6H 4) and [Fe 2(μ-CO)(μ-CAr)(CO) 2{(η 5-C 5H 4) 2SiMe 2}]BBr 4 (Ar=C 6H 5, p-MeC 6H 4, p-CF 3C 6H 4) are also reviewed.