Synthesis and characterization of bifunctional trans-(Ph 3P) 2Pt(CO 2Me)(X) complexes

Abstract

A series of trans-(Ph 3P) 2Pt(X)(Y) complexes (X = CO 2Me or CO; Y = CO 2Me, CO, OMe, OTf) has been prepared in order to determine the compatibility of electrophilic (CO, CO 2Me) and nucleophilic (OH, OMe) ligands in the same platinum coordination sphere. Dealkoxylation of CO 2Me complexes by trimethylsilyl triflate affords the corresponding cationic carbonyl derivatives, and represents a potentially useful metalloester deprotection method for controlling the formatioon of dimetalloester linkages. The crystal structure of [ trans-(Ph 3P) 2Pt(CO 2Me)(CO)]BF 4 has been determined, and reveals an unusual distortion of the PPtP angle perpendicular to the square planar coordination geometry. Attempted condensation reactions between trans-(Ph 3P) 2Pt(CO 2Me)(CO) + and trans-(Ph 3P) 2Pt(CO 2Me)(OH) did not yield a dimetalloester condensation product, presumably due to the steric bulk of the ancillary Ph 3P ligands.