Journal ArticleDOI
Tungstophosphoric acid (H3PW12O40) as a heterogeneous inorganic catalyst. Activation of hexamethyldisilazane (HMDS) by tungstophosphoric acid for efficient and selective solvent-free O-silylation reactions
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TLDR
Tungstophosphoric acid (H3PW12O40) effectively activates hexamethyldisilazane for the selective silylation of primary, secondary, tertiary and phenolic hydroxy groups under solvent-free conditions at 55-60 °C as mentioned in this paper.Abstract:
Tungstophosphoric acid (H3PW12O40) effectively activates hexamethyldisilazane for the selective silylation of primary, secondary, tertiary and phenolic hydroxy groups under solvent-free conditions at 55–60 °C.read more
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Protection (and deprotection) of functional groups in organic synthesis by heterogeneous catalysis.
TL;DR: This Discussion concludes with a summary of the main findings of the 2016 Redox Deprotections Update, which confirmed the need for further investigation into the determinants of redoxdeprotection in relation to nitrogenous Derivatives.
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A novel and highly efficient method for the silylation of alcohols with hexamethyldisilazane (HMDS) catalyzed by recyclable sulfonic acid-functionalized ordered nanoporous silica
Daryoush Zareyee,Babak Karimi +1 more
TL;DR: Silylation of alcohols with hexamethyldisilazane (HMDS) in dichloromethane provides the corresponding silyl ethers in almost quantitative yields at room temperature using 1−3 ǫ% of sulfonic acid-functionalized silica.
Journal ArticleDOI
Aluminumdodecatungstophosphate (AlPW12O40), a versatile and a highly water tolerant green Lewis acid catalyzes efficient preparation of indole derivatives
TL;DR: Aluminumdodecatungstophosphate (AlPW12O40) is a highly water tolerant, green Lewis acid has been applied as an efficient catalyst for the preparation of indole derivatives as bis(indolyl)methanes from carbonyl compounds via Friedel-Crafts alkylation and 3-substituted indoles via Michael addition of indoles to α,β-unsaturated carbonyls compounds in CH3CN at room temperature as discussed by the authors.
Journal ArticleDOI
Heteropoly acids, their salts and polyoxometalates as heterogenous, efficient and eco-friendly catalysts in organic reactions: Some recent advances
TL;DR: In this paper, some recent advances of applying heteropoly acids and polyoxometalates as heterogeneous, reusable and eco-friendly catalysts in organic synthesis are discussed, and some of them are discussed in detail.
References
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Heteropoly Acids and Related Compounds as Catalysts for Fine Chemical Synthesis
TL;DR: In this article, a wide variety of HPAs belonging to the so-called Keggin series are the most important for catalysis and they include heteropolyanions (HPANs) which have metal-oxygen octahedra as the basic structural units.
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Solid state organic chemistry : efficient reactions, remarkable yields, and stereoselectivity
Journal ArticleDOI
Insoluble heteropoly compounds as highly active catalysts for liquid-phase reactions
TL;DR: In this paper, a liquid phase alkylation of m -xylene or trimethylbenzene with cyclohexene was studied using heteropoly compounds and other typical solid acids as the catalysts.
Journal ArticleDOI
Catalysis by heterogeneous supported heteropoly acid
TL;DR: In this paper, the performance and availability of supported heteropoly acid under vapor phase conditions were studied through alkylation of benzene with ethylene, esterification of acetic acid with ethanol, and dehydration of 2-propanol as model reactions.
Journal ArticleDOI
Catalysis by Heteropoly Compounds. III. The Structure and Properties of 12-Heteropolyacids of Molybdenum and Tungsten (H3PMo12−xWxO40) and Their Salts Pertinent to Heterogeneous Catalysis
Makoto Misono,Noritaka Mizuno,Koichi Katamura,Atsushi Kasai,Yasuo Konishi,K. Sakata,Toshio Okuhara,Yukio Yoneda +7 more
TL;DR: In this article, the fundamental properties of 12-heteropolyacids of Mo and W, such as the structure, the surface area, the acidity, and the reduction-oxidation mechanism, have been studied in their solid state in relation to heterogeneous catalysis.
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