Study of solid acid catalysis for the hydration of α-pinene

Natural Zeolite Catalyst for Conversion of α-Pinene

“…The carbocation can lose a proton and generate monocyclic and bicyclic hydrocarbons or, in the presence of a nucleophile, give to monocyclic alcohol. In the conversion of terpenes, variation products might be obtained depending on the catalyst and reaction conditions [6]- [13].…”

The Acid Catalyzed Reaction of α-Pinene Over Y-Zeolite

“…Mochida et al [9] reported the use of zeolites and obtained 100% conversion but with low selectivity for alcohols (about 57%) for 240 min. Avila et al [2] used the catalysts TCA/ZrO 2 ·nH 2 O in conversion of α-pinene into hydrocarbons with conversion of 57% and selectivity of 75% of total alcohol and it showed 57% selectivity for α-terpineol for 300 min.…”

“…The acid transfers a proton to double bond of the alkene forming an intermediate of carbocation. The carbocation can lose a proton and generate monocyclic and bicyclic hydrocarbons or, in the presence of a nucleophile, give to monocyclic and bicyclic alcohol [2,8]. In the hydration of terpenes, variation products might be obtained depending on the catalyst and reaction conditions.…”

“…The main product of the acid-catalyzed hydration of α-or β-pinenes, renewable raw materials obtained from pine gum, is α-terpineol, which has many applications in the pharmaceutical and perfume industries [1][2]. The use of solid acid catalysts in the hydration/isomerisation reaction of α-pinene has been widely studied in recent years.…”

“…By controlling the reaction variable, it is possible to make it to be highly selective towards the desired products. Many efforts have been put on research to develop clean processes to afford the selectivity [2][3][4][5][6]. Y-zeolite may have potential in improving the selectivity of α-pinene in the reactions.…”