Chimie des fragrances Partie II : Synthese de la γ-ionone et des cis-et trans-γ-irones

Abstract A new convergent synthesis of γ-ionone and cis-and trans-γ-irones is described. A tandem 1,4-addition f'unctionnalisation reaction and a chemo-and regioselective olefination reaction are the key steps. A two dimensional NMR study allows the determination of the favoured configuration of one intermediate.