529496-90-0Relevant articles and documents
Dynamic properties of methyl(trimethylphosphane)nickel complexes containing (2-diphenylphosphanyl)phenylamido ligands
Klein, Hans-Friedrich,Beck, Robert,Hetche, Olaf
, p. 232 - 239 (2003)
P,N-chelates of nickel NiCl[2-(Ph2P)C6H4NR](PMe3) (1: R = H; 2: R = SiMe3) have been obtained from NiCl2(PMe3)2 and 2-(Ph2P)C6H4NRLi. Reaction with MeLi affords methylnickel compounds NiMe[2-(Ph2P)C6H4NR](PMe3) (3: R = H; 4: R = Me; 5: R = SiMe3). By the same route NiMe[2- (R1R2P)C6H4NR](PMe3) (6: R1 = R2 = CHMe2) was synthesized. Solutions in THF contain cis and trans isomers of square-planar complexes, and dynamic NMR spectroscopy shows dissociation of trimethylphosphane to be more rapid in the trans isomers. In a crystal of 5 the molecular structure is cis-5. Out of these complexes only 3 and 4 add trimethylphosphane to form pentacoordinate compounds NiMe[2- (Ph2P)C6H4NR](PMe3)2 (7, 8) in the crystal as shown by the molecular structure of 7 while in THF equilibria 7 ? cis-1 and 8 ? cis-2 are observed by NMR spectroscopy. The same solution properties are found with NiMe[2- (R1R2P)C6H4NR] (PMe3)2 (9: R1 = CMe3, R2 = Ph). Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003.
