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Synlett 1995; 1995(4): 289-298
DOI: 10.1055/s-1995-4946
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Oxidative Organic Transformations Catalyzed by Titanium- and Vanadium-Silicate Molecular Sieves

Pradeep Kumar1 , Rajiv Kumar2 , Bipin Pandey1
  • 1Division of Organic Chemistry: Technology, National Chemical Laboratory, Pune-411 008, India, Fax: 0091-212-330233/334761; e-mail: Otech@ncl.ernet.in
  • 2Catalysis Division, National Chemical Laboratory, Pune-411 008, India
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Publication History

Publication Date:
31 December 2000 (online)

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Titanium- and vanadium-silicate molecular sieves like TS-1/VS-1 and TS-2/VS-2 oxidize a variety of organic substrates e.g., alkanes, olefins, unsaturated alcohols, aldehydes, aromatics, amines and thioethers etc. under heterogeneous catalytic conditions using dilute hydrogen peroxide (30% aq.). Considerable regio-, stereo- and chemo-selectivity has been observed in above studies. Compared to V-silicates (VS-1/VS-2), Ti-silicates (TS-1/TS-2) are efficient in H2O2 utilization. V-zeolites can oxyfunctionalize even primary C-H bond in n-alkanes and side chain in alkyl substituted aromatics. Large pore V-zeolite (V-NCL-1) oxidizes even bulky aromatic compounds like xylenes, trimethyl benzenes, naphthalene etc. Mechanistically, heterolytic cleavage of H2O2 is preferred by TS-1/TS-2, whereas VS-1/VS-2 may involve homolytic cleavage.

titanium silicate - vanadium silicate - molecular sieves - zeolites - oxidation - dilute H2O2

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