Synthesis of gold(I), gold(III), and silver(I) complexes with ylide ligands derived from carbonylbis(methylenetriphenylphosphonium)diperclorate. Crystal and molecular structures of [Au2.mu.-CH(PPh3)2CO2](ClO4)2, [(Ph3PCCl2)2CO][AuCl4](ClO4), [(AuL)2.mu.-C(PPh3)C(O)CH(PPh3)(AuL)](ClO4)2 (L = PPh3), and [Au(PMe2Ph)4.mu.-C(PPh3)2CO](ClO4)2 | Publicación