02573nas a2200217   4500008004100000022001400041245006900055210006700124260007600191300001400267490000800281520180600289653003202095653003302127653002002160653003602180100001702216700001202233700001702245856009302262       2005                        eng d  a1364-503X00aNovel, benign, solid catalysts for the oxidation of hydrocarbons0 aNovel benign solid catalysts for the oxidation of hydrocarbons  a6-9 CARLTON HOUSE TERRACE, LONDON SW1Y 5AG, ENGLANDbROYAL SOCIETYcAPR  a1001-10120 v3633 a<p>The catalytic properties of two classes of solid catalysts for the oxidation of hydrocarbons in the liquid phase are discussed: (i) microporous solids, encapsulating transition metal complexes in their cavities and (ii) titanosilicate molecular sieves. Copper acetate dimers encapsulated in molecular sieves Y, AICM-22 and VPI-5 use dioxygen to regioselectively ortho-hydroxylate L-tyrosine to L-dopa, phenol to catechol and cresols to the corresponding o-dihydroxy and o-quinone compounds. Monomeric copper phthalocyanine and salen complexes entrapped in zeolite-Y oxidize methane to methanol, toluene to cresols, naphthalene to naphthols, xylene to xylenols and phenol to diphenols. Trimeric mu(3)-oxo-bridged Co/Mn cluster complexes, encapsulated inside Y-zeolite, oxidize para-xylene, almost quantitatively, to terephthalic acid. In almost all cases, the intrinsic catalytic activity (turnover frequency) of the metal complex is enhanced very significantly, upon encapsulation in the porous solids. Spectroscopic and electrochemical studies suggest that the geometric distortions of the complex on encapsulation change the electron density at the metal ion site and its redox behaviour, thereby influencing its catalytic activity and selectivity in oxidation reactions. Titanosilieate molecular sieves can oxidize hydrocarbons using dioxygen when loaded with transition metals like Pd, An or Ag. The structure of surface Ti ions and the type of oxo-Ti species generated on contact with oxidants depend on several factors including the method of zeolite synthesis, zeolite structure, solvent, temperature and oxidant. Although, similar oxo-Ti species are present on all the titanosilicates, their relative concentrations vary among different structures and determine the product selectivity.</p>10abenign catalytic oxidations10aencapsulated metal complexes10aSolid catalysts10atitanosilicate molecular sieves1 aRatnasamy, P1 aRaja, R1 aSrinivasi, D  uhttps://library.ncl.res.in/content/novel-benign-solid-catalysts-oxidation-hydrocarbons-001262nas a2200229   4500008004100000022001400041245010100055210006900156260007300225300001200298490000800310520038700318653002700705653003700732653001400769653003600783100002800819700001900847700002100866700001800887856012700905       2007                        eng d  a0926-860X00aRegio- and stereoselective synthesis of beta-amino alcohols over titanosilicate molecular sieves0 aRegio and stereoselective synthesis of betaamino alcohols over t  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcOCT  a145-1510 v3303 a<p>A novel application of titanosilicate molecular sieves in the synthesis of P-amino alcohols via aminolysis of epoxides, at mild and solvent-free conditions, is reported, for the first time. A range of beta-amino alcohols with nearly 100% regio- and stereoselectivity was produced over these reusable solid catalysts in high yields. (C) 2007 Elsevier B.V. All rights reserved.</p>10aAminolysis of epoxides10asynthesis of beta-amino alcohols10aTi-MCM-4110atitanosilicate molecular sieves1 aSatyarthi, Jitendra, K.1 aSaikia, Lakshi1 aSrinivas, Darbha1 aRatnasamy, P.  uhttps://library.ncl.res.in/content/regio-and-stereoselective-synthesis-beta-amino-alcohols-over-titanosilicate-molecular-0