Abstract

SYNTHESIS OF IONONES FROM CITRAL THROUGH PSEUDOIONONE INTERMEDIATE COMPOUND IN SOUTHERN VIETNAM

Nguyen Huu Duy Khang*, Pham Thi Thuy, Nguyen Thi Lan Huong and Nguyen Khanh Tan

ABSTRACT

Ionones (α, β isomers) was prepared from citral takes place via a strong mineral acid catalyzed two-step process. The first step is the aldol condensation of citral with acetone to give pseudoionone (PS). At the second step, the consecutive cyclization of PS to ionones is catalyzed by strong mineral acid H3PO4. Ionones (α, β isomers) was obtained in 56% yield (47% α-ionone and 9% β-ionone, according by GC-MS purity).

Keywords: Ionones, citral, pseudoionone.