INTERACTION OF HEXAPHENYLCARBODIPHOSPHORANE WITH THE TRIMETHYLPLATINUM(IV) CATION

Treatment of Me3Pt+X- (X~=PF6“, OSO2CF3-, or I-) with Ph3P=C=PPh3) a bis(ylide), gives [HC(PPh3)2]X, an ortho-metalated ylide-platinum(II) species, and methane. 13C-and 2H-labeling studies show that methane is formed by the combination of platinum methyl groups and ortho aromatic ylide hydrogen atoms. Methyl group transfer to an aromatic ring of an ylide ligand is also observed. This reaction is an example of ortho metalation in a high-valent transition-metal complex, which continues until all the platinum methyl groups are eliminated. © 1979, American Chemical Society. All rights reserved.