Preparation and structure of an unusually stable cationic µ-carbyne complex of rhodium

Abstract

The reaction of either [(η⁵-C₅Me₅)₂Rh₂(CO)₂{µ-C(OMe)Ar}] or [(η⁵-C₅Me₅)₂Rh₂(µ-CO){µ-C(OMe)Ar}] with H[BF₄]·OEt₂ yields the stable cationic carbyne complex [(η⁵-C₅Me₅)₂Rh₂(µ-CO)(µ-CAr)][BF₄]; the structure of the complex for which Ar = 4-MeC₆H₄, with a [BPh₄] counterion, was established in an X-ray diffraction study.