摘要:
Tridentate phosphine pincer ligands facilitate the protonolysis of cationic Pt-CH3 compounds ( to Pt dications and CH4) with the ammonium acid Ph2NH2 center dot BF4. Large rate enhancements over nonpincer analogues (> 50 000) are observed. A mechanism is proposed wherein ring strain present in the planar ground-state arrangement of three phosphine ligands is released in putative five-coordinate intermediates and transition states.