The reaction behavior of [Cp2Mo2(CO)4(μ,η2:2-P2)] and [Cp′′Ta(CO)2(η4-P4)] towards hydroxide and tert-butyl nucleophiles

Abstract

The reaction behavior of [Cp₂Mo₂(CO)₄(μ,η^2:2-P₂)] (1) and [Cp′′Ta(CO)₂(η⁴-P₄)] (2), respectively, towards the anions OH⁻ and ^tBu⁻ are reported. While the reaction of 1 with KOH gives the anionic complex [Cp₂Mo₂(CO)₄(μ-PH₂)]⁻ (3) under a formal phosphorus atom abstraction, reaction with Li^tBu leads to the alkylation product [Cp₂Mo₂(CO)₄(μ,η^2:1-PP^tBu)]⁻ (4). The reactions of 2 with [IDipp-H][OH] ([IDipp-H]⁺ = 1,3-bis-(2,6-diisopropyl-phenyl)imidazolium) and Li^tBu yield [Cp′′Ta(CO)₂{η³-P₄(O)H}]⁻ (5) and [Cp′′Ta(CO)₂(η³-P₄^tBu)]⁻ (6), respectively. Compounds 3, 4, 5 and 6 were comprehensively characterized by NMR spectroscopy and X-ray structure analysis.