SYNTHESIS AND CHARACTERIZATION OF BIFUNCTIONAL TRANS-(PH(3)P)(2)PT(CO(2)ME)(X) COMPLEXES

A series of trans-(Ph(3)P)(2)Pt(X)(Y) complexes (X = CO(2)Me or CO; Y = CO(2)Me, CO, OMe, OTf) has been prepared in order to determine the c ompatibility of electrophilic (CO, CO(2)Me) and nucleophilic (OH, OMe) ligands in the same platinum coordination sphere. Dealkoxylation of C O(2)Me complexes by trimethylsilyl triflate affords the corresponding cationic carbonyl derivatives, and represents a potentially useful met alloester deprotection method for controlling the formation of dimetal loester linkages. The crystal structure of [trans-(Ph(3)P)(2)Pt(CO(2)M e)(CO)]BF4 has been determined, and reveals an unusual distortion of t he P-Pt-P angle perpendicular to the square planar coordination geomet ry. Attempted condensation reactions between trans-(Ph(3)P)(2)Pt(CO(2) Me)(CO)(+) and trans-(Ph(3)P)(2)Pt(CO(2)Me)(OH) did not yield a dimeta lloester condensation product, presumably due to the steric bulk of th e ancillary Ph(3)P ligands.