摘要:
A number of substituted monocarbonyl complexes [Rh(MeCupf)(CO)(PR3)] (where R - Ph, p-MeOph, p-Tol, o-Tol and Cy, MeCupf = N-nitroso-N-(2-methylphenyl) hydroxylaminato bidentate ligand) have been prepared from [Rh(MeCupf)(CO)(2)] and identified by IR, UV/visible and NMR techniques. The kinetics and mechanism for the oxidative addition of iodomethane to [Rh(MeCupf)(CO)(PR3)] complexes have been investigated through the variation of steric and electronic effects of the phosphine ligands, as well as through varying the solvent and temperature. The Rh-III-alkyl complex was the primary species formed as a result of oxidative addition, followed by a consecutive slower formation of the Rh-III-acyl species by carbonyl-insertion. A detailed mechanism is discussed. (C) 2012 Elsevier B. V. All rights reserved.