作者:L. O. Nindakova、B. A. Shainyan
DOI:10.1023/a:1014338330802
日期:——
Transformation products of the cationic rhodium complex [(1,5-COD)Rh((-))R,R-DIOP]+CF3SO3- (1) (COD is cycloocta-1,5-diene and DIOP is (+/-)-2,3-O-isopropylidene-2,3-dihydroxy-1,4-bis(diphenylphosphino)butane), which were obtained in its reactions with molecular hydrogen, base (NEW, and solvents in the absence of a substrate, were investigated by H-1 and P-31 NMR spectroscopy. The solvate complexes [(SOIv)(2)Rh((-))R.R-DIOP]+CF3SO3-, which were generated from complex I in its reaction with molecular hydrogen, underwent destruction ofthe diphosphine ligand with elimination of benzene and were subjected to oxidation by traces of moisture and oxygen to form the DIOP dioxide complex with Rh-1. In the absence of hydrogen, complex 1 in solutions produced the diphosphine dioxide rhodium(I) complex and mono- and binuclear rhodium(l) solvate complexes. The scheme of deactivation of the complex in the absence of the substrate was proposed. The catalytic activity of the solvate complexes [(ArH)Rfi((-))R,R-DIOP]+CF3SO3-, which contain benzene, p-xylene, and mesitylene in the coordination sphere, was studied in hydrogenation of Z-alpha-acetamidocinnamic acid.