Reactions of bis[1,2-bis(dialkylphosphino)ethane]-(dihydrogen)hydridoiron(1+) with alkynes

Abstract

The compounds [FeH(H₂)(dmpe)₂]BPh₄ and [FeH(H₂)(depe)₂]BPh₄(dmpe = Me₂PCH₂CH₂PMe₂ and depe = Et₂PCH₂CH₂PEt₂) reacted with terminal alkynes R′CCH (R = Me, Prⁱ or Ph) to yield a variety of structures, apparently formed in sequence, bis(alkynyl), alkynyl(vinylidene) and substituted butenynyl complexes of iron(II), which also contain bis(diphosphines). The structures of trans-[Fe(CCMe)(CCHMe)(dmpe)₂]BF₄, trans-[Fe(CCPrⁱ)(CCHPrⁱ)(dmpe)₂]BF₄, [[graphic omitted]CHMe)-(depe)₂]BPh₄ and [[graphic omitted]CHPh)(dmpe)₂]BPh₄ have been determined and the interconversions of the complexes are discussed.