Protonation and alkylation of benzoyl(carbamoyl)-palladium(II) and -platinum(II) complexes to give cationic benzoyl complexes with O-protonated and O-alkylated carbamoyl ligands. Characterization of an intermediate in the reaction of trans-[Pd(COPh)(CO)(PMe3)2]BH4 with pyrrolidine to give trans-Pd(C