Precursors for the controlled release of a,b-unsaturated aldehydes or ketones and other high impact fragrance substances

A compound of formula (I)

• (i) wherein R is selected from the group consisting of hydrogen and C1 to C10 linear or cyclic alkyl, alkenyl or alkadienyl residues,
• R′ is selected from the group consisting of hydrogen and C1 to C10 linear or cyclic alkyl, alkenyl or alkadienyl residues,
• R1 is selected from the group consisting of hydrogen and C1 to C10 linear or cyclic alkyl, alkenyl or alkadienyl residues,
• R2 is selected from the group consisting of C4 to C15 linear, cyclic or branched alkyl residues, additionally comprising one, two or more functional groups selected from the group consisting of ether, alcohol, and ketone, and
• R3 is selected from the group consisting of hydrogen and C1 to C10 linear or cyclic alkyl, alkenyl or alkadienyl residues, or
• (ii) wherein R1, R2 and R3 are independently selected from the groups as defined in (i), respectively, and R and R1 are bonded together to form a saturated or unsaturated ring system comprising 5 to 10 carbon atoms, or
• (iii) wherein R1, R1 and R2 are independently selected from the groups as defined in (i), respectively, and R and R3 are bonded together to form a saturated or unsaturated, mono or bicyclic, ring system comprising 5 to 10 carbon atoms and optionally 1 or 2 ether functional groups.