Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
151326 | Chemical Engineering Journal | 2010 | 8 Pages |
Efficient protection of alcohols, phenols, amines, thiols and aldehydes has been carried out under catalysis by the highly active Preyssler heteropolyacid H14[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.