Cyclopropane complexes of platinum: some sunthetic studies and the reactivity and crystal structure of 1,6-dichloro-2,3-trimethylene-4,5-bis(pyridine)platinum(IV)

Abstract The mode of bonding of cyclopropane to platinum is described through a crystal structure determination of the complex [PtCI 2 (C 5 H 5 N) 2 C 3 H 6 )]. The crystals are monoclinic with a =13.37, b =13.11, c =8.40, β=91.1; space group P2 1 c and atomic parameters have been determined by a least-squares analysis of 1119 independent reflexion intensities. The geometry of the coordinated cyclopropane ligand is held to rule out the description as an ‘edge complex’. The syntheses of this and related complexes are described, with particular regard to the rearrangement reactions which provide pyridinium ylide complexes ofplatinum(II) and platinum(IV).