CINDECA   05422
CENTRO DE INVESTIGACION Y DESARROLLO EN CIENCIAS APLICADAS "DR. JORGE J. RONCO"
Unidad Ejecutora - UE
artículos
Título:
Preyssler heteropolyacid H14[NaP5W29MoO110]: A heterogeneous, green and recyclable catalyst used for the protection of functional groups in organic synthesis
Autor/es:
GUSTAVO ROMANELLI; DIEGO RUIZ; PATRICIA VÁZQUEZ; HORACIO THOMAS; JUAN AUTINO
Revista:
CHEMICAL ENGINEERING JOURNAL
Editorial:
ELSEVIER SCIENCE SA
Referencias:
Lugar: Amsterdam; Año: 2010 vol. 161 p. 355 - 355
ISSN:
1385-8947
Resumen:
Efficient protection of alcohols, phenols, amines, thiols and aldehydes has been carried out under catalysis by the highly active Preyssler heteropolyacidH14[NaP5W29MoO110] (H14PMo). In this paper we report the catalytic activity of bulk H14PMo in each procedure to form: 2 tetrahydropyranyl acetals of alcohols and phenols, working at room temperature and using toluene as solvent; aldehyde 1,1-diacetates (acylals), a solvent-free preparation using Ac2O at room temperature; alcohol acetates, phenols, amines and thiols, working at room temperature, using toluene as solvent and Ac2O as acetylating agent; benzhydryl-ethers from the reaction of alcohols or phenols and diphenylmethanol, in toluene at 60–80 ◦C; and silylation of phenol and alcohols with hexamethyldisilazane as silylating agent in toluene at 85 ◦C. All the described procedures provide useful alternatives for performing the protection of different functional groups, which are general, rapid, selective and inexpensive, and have a low environmental impact. The catalyst was easily recovered and reusable in all of the described procedures, without loss of its catalytic activity.
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