32445-02-6Relevant articles and documents
Highly selective oxidation of alkylphenols to p-benzoquinones with aqueous hydrogen peroxide catalyzed by divanadium-substituted polyoxotungstates
Ivanchikova, Irina D.,Maksimchuk, Nataliya V.,Maksimovskaya, Raisa I.,Maksimov, Gennadii M.,Kholdeeva, Oxana A.
, p. 2706 - 2713 (2014/08/18)
The catalytic performance of divanadium- and dititanium-substituted γ-Keggin polyoxotungstates, TBA4H[γ-PW10V 2O40] (I, TBA = tetra-n-butylammonium), TBA 4H2[γ-SiW10V2O40] (II), and TBA8[{γ-SiW10Ti2O 36(OH)2}2(μ-O)2] (III) has been assessed in the selective oxidation of industrially important alkylphenols/naphthols with the green oxidant 35% aqueous H2O 2. Phosphotungstate I revealed a superior catalytic performance in terms of activity and selectivity and produced alkylsubstituted p-benzo- and naphthoquinones with good to excellent yields. By applying the optimized reaction conditions, 2,3,5-trimethyl-p-benzoquinone (TMBQ, vitamin E key intermediate) was obtained in a nearly quantitative yield via oxidation of 2,3,6-trimethylphenol (TMP). The efficiency of H2O2 utilization reached 90%. The catalyst retained its structure under turnover conditions and could be recycled and reused. An active peroxo vanadium complex responsible for the oxidation of TMP to TMBQ has been identified using 51V and 31P NMR spectroscopy.
Kinetics and mechanism of the oxidation of alkyl substituted phenols and naphthols with tBuOOH in the presence of supported iron phthalocyanine
Zalomaeva, Olga V.,Ivanchikova, Irina D.,Kholdeeva, Oxana A.,Sorokin, Alexander B.
body text, p. 1031 - 1037 (2010/08/22)
2,3,5-Trimethylbenzoquinone (precursor of vitamin E) and 2-methylnaphthoquinone (vitamin K3) were obtained in good yields by oxidation of 2,3,6-trimethylphenol and 2-methyl-1-naphthol, respectively, with tBuOOH catalyzed by supported
