Synthesis and X-ray structural investigation of cis-hydrido(triphenylsilyl)-1,4-butanediyl-bis-(dicyclohexylphosphine)platinum(II)
摘要:
The title compound was prepared by the oxidative addition of triphenylsilane to Pt0[1,4-(Cy2P(CH2)4PCy2)] (where Cy = cyclohexyl) generated in situ. The crystal structure of cis-H(Ph3Si)Pt[Cy2P(CH2)4PCy2] (2) has been determined by single-crystal X-ray diffraction techniques. The square planar geometry about the platinum atom is angularly distorted with a bite angle between the diphosphine ligands (P-Pt-P) of 102.3(1)-degrees. Details of the structural content and selected bond lengths and angles are discussed and presented. The phenyl rings are planar and the cyclohexyl rings are in chair conformations. The enlarged tetrahedral angles at the phosphorus and silicon atoms are probably due to the steric bulk of the ligands. ''Ligand profile'' calculations (theta/2 vs phi) have been performed to probe the steric interaction about the diphosphine and triphenylsilyl ligands.
A study of the generality of the reaction of diazomethane with halogenoplatinum(II) complexes in the preparation of (halogenomethyl)platinum(II) complexes
作者:Robert McCrindle、Gilles J. Arsenault、Rajeev Farwaha、Mark J. Hampden-Smith、Richard E. Rice、Alan McAlees
DOI:10.1039/dt9880001773
日期:——
Treatment of a range of platinum(II) halide (mainly chloride) complexes with diazomethane has been examined. Formation of both mono- and bis-halogenomethyl products has been observed. With one exception, methylene insertion appears to occur only when the metal–halogen bond is trans to a group of high trans influence (olefin, phosphine, isocyanide, alkyl, or hydride). With the trans-chlorohydrido derivatives