Opening of an Ir4 cluster: the reactions of [Hlr4(CO)10(µ-PPh2)] with PPh2CCPh

Abstract

Reaction of [Hlr₄(CO)₁₀(µ-PPh₂)]1 with PPh₂CCPh yields the CO replacement compound [Hlr₄(CO)₉(PPh₂CCPh)(µ-PPh₂)]3, that is readily converted to the species [Ir₄(CO)₇(µ-CO)(µ-PPh₂)₂(µ₃-η²-HC₂Ph)]4; reaction of 1 with PPh₂CCPh in the presence of base, followed by protonation, affords the novel compound [Hlr₄(CO)₉(µ₄-η³-PPh₂C₂Ph)(µ-PPh₂)]5.