STRUCTURAL FEATURES OF CHLORO(DIMETHYLPHENYLPHOSPHONIUM(TRIMETHYLSILYL)METHYLIDE)(1,5-CYCLOOCTADIENE)PALLADIUM(II) HEXAFLUOROPHOSPHATE

Coordination complexes of ylides have been of interest as examples of compounds containing alkyl ligands which show exceptional stability due to the zwitterionic character of the ylide.1 Itoh and co-workers have reported the preparation of palladium(II) complexes formed with the prochiral phospho-nium (trimethylsilyl)methylide, PhMe2P=CH(SiMe3).2 The dimeric complex [Pd(CH(PPhMe2)(SiMe3))Cl2]2 was formed by treating PdCl2(PhCN)2 with PhMe2=CH(SiMe3). Abstraction of chloro ligands with AgPF6 in the presence of 1,5-cyclooctadiene produced the diolefin complex [Pd(l,5-C8H12)(CH(PPhMe2)(SiMe3))Cl]PF6. For establishment of the mode of coordination of the ylide ligand in this complex a molecular structure analysis was undertaken. © 1979, American Chemical Society. All rights reserved.