ItemArticle

Efficient cyclization of 1,5-dienes to industrially important terpenes using amorphous metal aluminophosphate catalyst: A continuous flow approach

Title
Efficient cyclization of 1,5-dienes to industrially important terpenes using amorphous metal aluminophosphate catalyst: A continuous flow approach
Creator
Kopparapu, Imam; Binish, C.J.; Vijayasankar, A.V.
Description
Amorphous metal aluminophosphate was used for the first time in a continuous flow process for the cyclization of pseudoionones. A series of metal aluminophosphates was synthesized by a simple coprecipitation method and characterized using various techniques to determine the physico-chemical properties of the materials. The synthesized metal aluminophosphates were evaluated as catalysts in the cyclization of pseudoionone via a continuous flow process utilizing a coil flow reactor. All catalysts facilitated the formation of ?- and ?-isomers of ionones through the cyclization of pseudoionone. Calcium aluminophosphate demonstrated a higher catalytic efficiency of 96 % compared to other reported methods, which is attributed to its large surface area, surface acid sites, and reduced by-product inhibition. The reaction was optimized by varying parameters such as catalyst amount, reaction temperature, pressure, and retention time and compared with a batch process. The scope of the reaction was investigated by employing a variety of terpene ketones. A suitable reaction mechanism was proposed which highlights the role of the surface acidity of the catalyst in the formation of a cyclized ring. The catalyst exhibited excellent reusability, maintaining its efficiency over three consecutive cycles with minimal degradation. 2025 The Authors
Source
Results in Surfaces and Interfaces;Volume;19;Issue;;Article No.;100539;
Date
01-01-2025
Publisher
Elsevier B.V.
Subject
Amorphous metal aluminophosphate; Calcium aluminophosphate; Continuous flow process; Cyclization; Terpenes
Coverage
Kopparapu I., Department of Chemistry, CHRIST (Deemed to be University), Bangalore, 560029, India; Binish C.J., Department of Chemistry, CHRIST (Deemed to be University), Bangalore, 560029, India; Vijayasankar A.V., Department of Chemistry, CHRIST (Deemed to be University), Bangalore, 560029, India
Rights
All Open Access; Gold Open Access
Relation
ISSN: 26668459;
Format
online
Language
English
Type
Article

Citation

Kopparapu, Imam; Binish, C.J.; Vijayasankar, A.V., “Efficient cyclization of 1,5-dienes to industrially important terpenes using amorphous metal aluminophosphate catalyst: A continuous flow approach,” CHRIST (Deemed To Be University) Institutional Repository, accessed June 18, 2026, https://archives.christuniversity.in/items/show/22447.

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