Light‐Induced Fragrance Release from 2‐Oxoacetates: Impact of Compound Mixtures on the Efficiency of the Norrish Type II Photoreaction in Solution and in Encapsulation Systems

Abstract

AbstractUnderstanding interactions between perfumes and fragrance delivery systems is key to optimising the performance of perfumed consumer articles in practical applications, where complex compound mixtures are typically used. Possible interactions of perfume ingredients on the kinetics of the Norrish type II photofragmentation of 2‐oxoacetates, used as light‐sensitive profragrances for the controlled release of volatile perfumery aldehydes and ketones, were investigated in solution. We found that (Z)‐phenyl alkene derivatives isomerised to the corresponding E‐isomers in the presence of 2‐oxo‐2‐phenylacetates, and thus considerably decreased the rate of the targeted photofragmentation. The light‐induced fragrance release from encapsulated or non‐encapsulated 2‐oxo‐2‐phenylacetate profragrances in the presence of different amounts of perfumes showed that compounds interfering with the photoreaction should be encapsulated to only a minimum extent in core‐shell microcapsules, independent of whether the profragrance is encapsulated in the same or in a different capsule, or whether it is part of the non‐encapsulated perfume oil.