Conjugate Polymer-Supported Acid Catalysts: An Efficient and Reusable Catalyst for the Synthesis of Geminal Diacetates (Acylals) Under Solvent-Free Conditions

Abstract

A comparative study on the catalytic activity of conducting polyaniline (PANI), polypyrrole (PPY), and poly-(3,4-ethylenedioxythiophene) (PEDOT) salts as solid acid catalysts for the synthesis of 1,1-diacetates (acylals) under solvent-free conditions has been presented. Use of the polypyrrole and poly-(3,4-ethylenedioxythiophene) salts as solid acid catalysts is reported for the first time. Preparation, recovery, and reusability of the catalysts were found to be good.

Keywords:

• 1,1-Diacetates
• ecofriendly catalyst
• polymer-supported catalyst
• reusable catalyst

ACKNOWLEDGMENT

We gratefully acknowledge the financial support from the Research Council of Shahid Beheshti University.

Notes

^a Reaction conditions: acetic anhydride (0.2 mL, 2 mmol), benzaldehyde (1 mmol), catalyst (1–5.4 mol%), 20 min, at rt.

^b Isolated total yield.

^c The yields of three subsequent runs using the same recovered catalyst.

^d 30 °C for 5 h.

^a Isolated yields.