Activities of Heterogeneous Acid-Base Catalysts for Fragrances Synthesis: A Review

Abstract

This paper reviews various types of heterogeneous acid-base catalysts for fragrances preparation. Catalytic activities of various types of heterogeneous acid and base catalysts in fragrances preparation, i.e. non-zeolitic, zeolitic, and mesoporous molecular sieves have been reported. Generally, heterogeneous acid catalysts are commonly used in fragrance synthesis as compared to heterogeneous base catalysts. Heteropoly acids and hydrotalcites type catalysts are widely used as heterogeneous acid and base catalysts, respectively. © 2013 BCREC UNDIP. All rights reserve

Catalytic Activities of Fe3+- and Zn2+-Natural Zeolite on the Direct Cyclisation-Acetylation of (R)-(+)-Citronellal

“…Characterisation and catalytic activity examination of modified synthetic zeolites and natural zeolites from several countries were reported on some organic reactions such as in Knoevenagel condensation reaction [6], synthesis of fragrances [7], and cyclisation of citronellal into isopulegol [8,9]. Cyclysation-acetylation of citronellal with FeCl3 Catalyzed showed that in high temperature selectivity to produce IPA was low, and the major product was p-cymene as the side product [10].…”