Organometallic sulfato- and phosphato-allyl complexes synthesized from regioselective addition of oxyacids to an η3-allenyl–propargyl complex

Regioselective addition of hydrogen sulfate or dihydrogen phosphate anion to cationic η3-allenyl–propargyl platinum complex [Pt(PPh3)2(η3-C3H3)](BF4) (1) generates a new neutral η3-2-sulfatoallyl complex Pt(PPh3)2[η3-CH2C(OSO3)CH2] (2) or a η3-2-hydrogenphosphato-allyl complex Pt(PPh3)2[η3-CH2C(OPO3H)CH2] (5), respectively. Further addition of 5 to 1 gives a cationic η6-diallylphosphato dinuclear complex {Pt(PPh3)2[η3-(CH2)2C]2(PO4)}(BF4) (6) which undergoes hydrolysis to yield a μ4-phosphate-bridging diplatina complex Pt2(PPh3)4[μ4-(PO4)] (7) along with the formation of acetone. The structures of complexes 2 and 7 have been determined by crystallography.