Search results for "azoxybenzenes"
showing 2 items of 2 documents
Preparation, separation and identification of some para-substituted ONN and NNO trans-azoxybenzenes
2001
A series of para-substituted azoxybenzenes was obtained as model compounds for the investigation on the mechanism of Wallach rearrangement. Oxidation of azobenzenes with hydrogen peroxide in acetic acid solution, provided mixtures of α and β isomers. Some couples of the products were separated, using chromatography and crystallization techniques, and identified on the basis of their carbon NMR and mass spectra. The SCSD algorithm can be applied to the interpretation of the 13C-NMR spectra. Recognition of the ipso and para carbons suffice to the identification of an isomer, hence there are no strong interactions between the azoxy group and another substituent across the aromatic ring. Fragme…
Direct P-functionalization of azobenzene by a cationic phosphidozirconocene complex.
2016
International audience; We report that the cationic phosphidozirconocene complex [(eta(5)-C5H5)(2)Zr(PCy2)][CH3B(C6F5)(3)] (II) reacts with azobenzene, resulting in the expedient formation of Zr complex (2) bound to a tridentate PNN ligand. This reaction proceeds by a mechanism of cooperative nucleophilic substitution of hydrogen. The intermediate sigma(H) adduct (1) has been characterized by NMR spectroscopy.