Convenient syntheses of 2,5-diester-substituted phosphametallocenes and 2,2′,5,5′-tetraester-substituted-1,1′-diphosphaferrocenes are described. Studies of the reactivity of alkali metal 3,4-dimethylphospholide, 2-ester-3,4-dimethyl phospholide and 2,5-diester-3,4-dimethylphospholide anions towards iron(II) centres (as [Fe(AlCl4)2] or [Fe(MeCN)6(BF4)2]) indicate that the corresponding 1,1′-diphosphaferrocenes are obtained without any complications resulting from redox chemistry at the iron centre.
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