PHOSPHORUS PENTOXIDE-MONTMORILLONITE K-10 AS CATALYST FOR THE PREPARATION OF 1,1-DIACETATES UNDER SOLVENT-FREE CONDITIONS

Abstract

A facile and efficient method for the preparation of 1,1-diacetates of aldehydes is improved. P₂O₅/montmorillonite K10 catalyzed 1,1-diacetates formation from aldehydes in dry media. Both aromatic and aliphatic aldehydes gave high yields (70–95%) of the corresponding 1,1-diacetates. Advantages of this method are the use of an inexpensive and selective catalyst, with high yields in simple operation and short reaction time under solvent-free conditions.

Keywords:

• Aldehydes
• 1,1-diacetates
• montmorillonite
• phosphorus pentoxide
• protection

We are thankful to the Sistan and Baluchestan University Research Council for partial support of this work.

Notes

^a Isolated yield.

^b All the compounds give satisfactory spectral analysis (IR and ¹H-NMR).

^c 100% aldehyde recovered.

^d 6 equiv. of acetic anhydride were used, conversion rate = 39%.