Naima Bouchry, J. Aune, G. Coudurier
1995
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Journal
Bulletin de la Société Chimique de France
Abstract
The reaction products obtained upon reduction of β-ionone were cis-dihydroionone, dihydro-β-ionone, tetrahydroionone, dihydro-α-ionone and small quantities of alcohols. Selectivity towards each product is not affected by the reaction conditions such as temperature (261-318 K), hydrogen pressure (0.11-0.53 MPa), β-ionone concentration (0.28-2.45 M) and the nature of the solvent. Under our working conditions, the order of the reaction with respect to the substrate is negative and the process is half an order in hydrogen pressure. The catalytic hydrogenation of α-ionone has been carried out in the same conditions and the selectivity of dihydro-α-ionone reaches 76%. It appears that the conjugate ability of the system in β-ionone is responsible for the selectivity to the cis-dihydroionone (66%) obtained during the catalytic hydrogenation of the second product