Synthesis and characterization of BEA-SO3H as an efficient and chemoselective acid catalyst

BEA zeolite was synthesized under hydrothermal condition and modified with various amounts of chlorosulphonic acid. It was characterized by XRD, XRF, FT-IR, BET, thermogravimetric analysis and SEM techniques. Catalytic activity of BEA-SO3H was tested for the synthesis of 1,1-diacetates from a variety of aromatic and aliphatic aldehydes including those carrying electron donating or withdrawing substituents by acetic anhydride. At optimized conditions, The BEA-SO3H (28 wt.%) catalyst showed good yield at very short time for the synthesis and deprotection of 1,1-diacetates. Furthermore, BEA-SO3H was found to be recyclable for the protection of aldehydes with acetic anhydride under solvent-free and room temperature conditions. This method is a green approach for the protection of aldehydes in the presence of ketones.

BEA zeolite was synthesized and modified with various amounts of chlorosulphonic acid. The BEA-SO3H (28 wt.%) showed good yield at very short time for the synthesis and deprotection of 1,1-diacetates.Figure optionsDownload high-quality image (92 K)Download as PowerPoint slideResearch highlights▶ BEA-SO3H was prepared with various amounts of chlorosulphonic acid without using organosilica and bridged organosilane precursors. ▶ BEA-SO3H catalyst showed good yield at very short time for the synthesis and deprotection of 1,1-diacetates. ▶ BEA-SO3H was found to be recyclable for the protection of aldehydes with acetic anhydride. ▶ BEA-SO3H showed good chemo-selectivity and shape-selectivity for the preparation of 1,1-diacetates.