Easy Preparation of Collman-Type Reagents: Reaction Of [HFe(Co)₄]⁻ with tris(Dimethylamino)phosphine

Abstract

The reaction of tris(dimethylamino)phosphine with MHFe(CO)₄ (M = Na, K) is described. Instead of a CO-substitution at the Fe atom, a formal Me₂- substitution occurs at the P atom. Simultaneously, the Collman-type reagent M₂Fe(CO)₄ is produced in good yield.

Notes

A color change from brown-pink to yellow is observed, but IR and ³¹P NMR monitoring of the solution do not indicate any transformation. Such a triggerring by evaporation has been reported for the synthesis of [Et₄N]⁺, [HFe(CO)₃(PPh₃)]-, a precursor for [Fe(CO)₃(PPh₃)]^2-, a monophosphorus analog of the Collman dianion: Chen, Y. S. and Ellis, J. E., J. Am. Chem. Soc., 1982, 104, 1141.