Abstract— The sensftized photooxidation of methyl β ionylidene acetates (I) in methanol was studied. After reduction three products were isolated and their structures determined: a peroxide (II) and two isomeric alcohols (III and IV). The formation of (IV) is particularly interesting, its allenic structure being closely related to those of several important carotenoids.
L'ACCENT a Ct C mis rdcemment sur le r6le important que peut jouer I'oxygkne singulet dans I'environnement naturel, pollution, action candrigkne, processus de vieillissement de composes biologiques [ 1,2].La recherche d'inhibiteurs plus ou moins spkcifiques de I'oxygkne singulet apparait donc particulikrement intdressante quand on considkre les effets nocifs de ce dernier.Un certain nombre de composCs ont dCjB Ct C dCcrits comme posskdant cette propriCtC; toutefois, il semble que ce soit seulement pour le / 3 carotene en milieu riche en benzene que I'on ait des preuves convaincantes [3,4,9].
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