Synthesis and reactivity of phosphonato, phosphato and arsonato complexes of platinum(II)

Abstract

Treatment of the complexes cis-[PtCl₂L₂](L = donor ligand) with phenylphosphonic acid, methylphosphonic acid, phenyl dihydrogenphosphate or phenylarsonic acid in the presence of an excess of silver(I) oxide in refluxing dichloromethane yielded the new metallacycles [[graphic omitted]}L₂], [[graphic omitted]}L₂], [[graphic omitted]}L₂] or [[graphic omitted]}L₂] respectively. The X-ray crystal structure of [[graphic omitted]}(PMePh₂)₂] showed the presence of a slightly puckered metallacyclic ring with the phosphoryl oxygen adopting an equatorial position. A decomposition product of the complex [[graphic omitted]}{P(CH₂Ph)Ph₂}₂] in solution was shown, via an X-ray crystal structure determination, to be the diorthometallated complex cis-[[graphic omitted]Ph₂)₂].