Large-ring complexes formed from diacetylene diphosphines of the type But2PCC[CH2]nCCPBut2(n= 4 or 5); X-ray structure of [IrCl(CO){But2PCC[CH2]5CCPBut2}]

Abstract

Diacetylene diphosphines of the type Bu^t₂PCC[CH₂]_nCCPBu^t₂(n= 4 or 5) give, with iridium halogeno–carbonyls, large-ring mono- or bi-nuclear species and the X-ray structure of trans-[IrCl(CO){Bu^t₂PCC[CH₂]₅CCPBu^t₂}] is reported; with platinum or palladium halides very large-ring polynuclear species are formed, e.g. a 72-atom ring in [PtCl₂{Bu^t₂PCC[CH₂]₅CCPBu^t₂}]₆.