“Synthesis of ionones by cyclization of pseudoionone on solid acid catalysts”

VERÓNICA K. DÍEZ; CARLOS R. APESTEGUÍA; JUANA. I. DI COSIMO

CATALYSIS LETTERS

Springer

Año: 2008 vol. 123 p. 213 - 219

1011-372X

Ionone synthesis (a, b and g isomers) by pseudoionone cyclization was studied on zeolite HBEA, Amberlyst 35W, SiO2-Al2O3, and unsupported and silica-supported heteropolyacids (HPA/SiO2). Ionone formation was preferentially promoted on strong Brønsted acid sites. A 79 % ionone yield was obtained on 58.5 wt. % HPA/SiO2 after 1.5 h of reaction at 383 K and 250 kPa. This value is similar to the best yields reported for the homogeneously-catalyzed reaction using sulfuric acid.