Efficient tetrahydropyranylation of phenols and alcohols catalyzed by supported Mo and W Keggin heteropolyacids
GP Romanelli, PG Vázquez, LR Pizzio…
Index: Romanelli; Vazquez; Pizzio; Caceres; Blanco; Autino Synthetic Communications, 2003 , vol. 33, # 8 p. 1359 - 1365
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Citation Number: 18
Abstract
Abstract The protection of phenols as tetrahydropyranyl acetals is studied using supported Keggin heteropolyacids as catalysts, specifically molybdophosphoric or tungstophosphoric acids supported on silica. Phenol tetrahydropyranyl acetals are obtained in short times at room temperature with excellent yields. Protection of alcohols is also performed under mild conditions using both supported heteropolyacids, with yields ranging between good and ...
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