Reactivity of a Borane-Appended 1,1′-Bisphosphinoferrocene Ligand: Transition Metal and Lewis Acid Coordination, Cyclopentadienyl Ring Borylation, and Boronium Cation Generation

Abstract

The reaction of a borane-appended analogue of 1,1′-bis(phosphino)ferrocene, [Fe(η5-C5H4PPh2)(η5-C5H4P t Bu{(o-BPh2)C6H4})] (FcPPB), with [W(CO)6] under photochemical conditions lead to [W(CO)4(FcPPB*)] (1) (FcPPB* = [Fe(η5-C5H4PPh2){η5-C5H3P( t Bu)C6H4-o-BPh}]), in which the borane has added to a cyclopentadienyl ring of the ligand backbone and benzene has been eliminated. Formation of 1 did not occur under thermal conditions, and …