REACTIVITY MODES OF BRIDGED BIMETALLIC 5-C5H5)Fe(CO)>2-μ-dppe WITH ELECTROPHILES. PREPARATION AND REACTIONS OF BIMETALLIC HYDRIDE COMPLEXES

Article abstract of DOI:10.1016/S0022-328X(00)90635-1

The complex <(η⁵-C5H5)Fe(CO)>2-μ-dppe (dppe = ethane-1,2-bisdiphenylphosphide) (I) reacts with electrophiles through a μ-CO and forms Lewis acid O-adducts with alkylating reagents (giving cationic μ₂-alkoxycarbyne compounds) or with alkylaluminum compounds.Treatment of I with acid affords a stable μ₂-hydride salt (IV), 2(μ₂-H)(μ₂-dppe)⁺, which serves as an intermediate in the stepwise hydrogenation (reversibly) of I to a bridged bimetallic dihydride, 2-μ₂-dppe.This dihydride serves as a hydride donor, regenerating IV, towards Ph3C⁺ o r CpFe(CO)2(η²-CH2=CH2)⁺ hydride acceptors.The necessity of the μ₂-dppe as a mechanical linkage in facilitating some bimetallic reactions is also established.