Oxygen atom transfer reaction involving oxomolybdenum complexes with sterically bulky thiocarboxylate ligands and biochemical interesting substrates in methanol at neutral pH
摘要:
Oxidation-reduction reactions of substrates in systems containing the complex [(MoO2)-O-VI(O2CC(S)CH3Ph)(2)](2-) in methanol have been investigated as models of ore-transfer reactions. At neutral pH, the [(MoO2)-O-VI(O2CC(S)CH3Ph)(2)](2-) reacts with Me2PhP or n-butanethiol to yield a [(MoO)-O-IV(O2CC(S)CH3Ph)(2)](2-) species and Me2PhPO or disulfide, respectively The (MoO)-O-IV complex reduces a variety of substrates XO = Me2SO and pyridine N-oxide conducing formation of X = Me2S and pyridine. The occurrence of these reactions produces a catalytic system Me2PhP + XO --> Me2PhPO + X and 2BuSH + XO --> [BuS](2) + X + H2O. In this work we have also included the study of the reaction with biochemical interesting substrates, such as the reduction of nitrobenzene to aniline and catalytic air oxidation of benzoin to benzil. (C) 1999 Elsevier Science S.A. All rights reserved.
Synthesis and characterization of molybdenum(VI)-dioxo complexes containing both coordinated thiolate and carboxylate groups. Reactions with their own free ligands
作者:Hong Li、Pedro Palanca、Vicent Sanz、M. Teresa Picher、Luis R. Domingo、Antonio Doménech、José-Vicente Folgado
DOI:10.1016/s0020-1693(97)05725-3
日期:1998.2
The synthesis, characterization and spectroscopic properties of a group of Mo(VI) complexes having thiocarboxylate ligands of type [(MoO2)-O-VI(O2CC(S)MePh-X)(2)](2-) have been reported (X = H,p-Me,p-Cl). The peak potential for the Mo(VI) reduction increases according to the electron-donor ability of X (Me > H > Cl), Reaction of these Mo(VI) complexes with their own free ligands has been studied by ESR and UV-Vis spectroscopy, yielding the monomeric [(MoO)-O-V(O2CC(S)MePh-X)(2)](-) as unique complex products. The kinetic study of this oxidation reaction has also been investigated. (C) 1998 Elsevier Science S.A.