Abstract
Treatment of a tetrahydrofuran solution of Fel2, with two equivalents of Ph2PCH2PPh2(dppm), under an atmosphere of CO, gave trans,mer-[Fel2(CO)(dppm-PP′)(dppm-P)](1b) in high yield. The bromide analogue was prepared similarly but was unstable. Treatment of compound (1b) with [Pd(dba)2](dba = dibenzylideneacetone) in benzene, under an atmosphere of CO, gave the bimetallic iron(I)–palladium(I) complex [lFe(CO)2(µ-dppm)2Pdl](2c). Complex (2c) was protonated by HBF4·OEt2, to give the cationic hydride [lFe(CO)2(µ-dppm)2(µ-H)Pdl]BF4, which was characterised only in solution. Treatment of (2c) with MeNC caused displacement of both iodide and carbonyl ligands from iron to give [(MeNC)3Fe(µ-dppm)2PdI]I, whereas treatment of (2c) with the bulky isocyanide ButNC displaced only iodide to give [(ButNC)(OC)2Fe(µ-dppm)2PdI]I. N.m.r. (1H- and 31P-{1H}) and i.r. data are reported.
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