Hydrolytically labile pro-fragrances containing alpha, beta unsaturated esters

A pro-fragrance compound of formula (I)

• or a cis/trans isomer thereof,
• wherein:
• R, R1, R2, R3, and R5 are, independently of each other, selected from H, or linear or branched, saturated or unsaturated, substituted or unsubstituted hydrocarbon groups including up to 20 carbon atoms and optionally up to 6 heteroatoms;
• or
• R and one of the groups of R1, R2 and R3 form a substituted or unsubstituted hydrocarbon ring selected from substituted or unsubstituted cycloalkyl, cycloalkenyl or aryl groups including up to 12, carbon atoms, or substituted or unsubstituted heterocycloalkyl, heterocycloalkenyl or heteroaryl groups including up to 12 carbon atoms, and 1 to 6 heteroatoms selected from O, S, and N, or linear or branched, substituted or unsubstituted alkylcycloalkyl, alkenylcycloalkyl, alkylcycloalkenyl, alkenylcycloalkenyl, alkylaryl or alkenylaryl groups including up to 20 carbon atoms, or linear or branched, substituted or unsubstituted heteroalkylcycloalkyl, heteroalkenylcycloalkyl, heteroalkylcycloalkenyl, heteroalkenylcycloalkenyl heteroalkylaryl or heteroalkenylaryl groups including up to 20 carbon atoms, and 1 to 6 heteroatoms selected from O, S, and N, or linear or branched, substituted or unsubstituted heteroalkylheterocycloalkyl, heteroalkenylheterocycloalkyl, heteroalkylheterocycloalkenyl, heteroalkenylheterocycloalkenyl, heteroalkylheteroaryl or heteroalkenylheteroaryl groups including up to 20 carbon atoms, and 1 to 6 heteroatoms selected from O, S, and N;
• wherein R4 is an electron-withdrawing group;
• wherein at least one of R, R1, R2, and R3 is not hydrogen and that R, R1, R2, and R3 together with the carbon atoms to which they are attached are derived from a fragrance ketone or aldehyde of the formula (II)
• wherein R, R1, R2, and R3 are as defined above.