Synthesis and crystal structure of 3,3,4-tricyano-2,2-bis(triphenyl-phosphine)-1-oxa-2-platinacyclobutane

Abstract

The title complex has been prepared from the reaction of [Pt(PPh₃)₂(C₂H₄)] with 2,2,3-tricyano-oxacyclopropane, and the crystai structure has been determined by X-ray single-crystal analysis. Crystals are monoclinic, space group P2₁/n, with a= 10.820(7), b= 18.827(9), c= 18.581(9)Å, and β= 105.4(1)°. The structure has been solved by the heavy-atom method and refined to R 0.048 for 1780 reflections. The structural results confirm that platinum is inserted into the carbon–oxygen bond. X-Ray and n.m.r. data of this and similar metallacycles are compared and discussed on the basis of a simple bonding model.