Enol ether pro perfume

A method to release from a precursor compound, compounds selected from the group consisting of

• a) a ketone or aldehyde of formula
• wherein n represent an integer between 0 and 5;
• R1, simultaneously or independently, represents at least one substituent of the aromatic ring and is a hydroxyl group, a C1-6 alkyl group, a C1-6 alkoxy group or a RCOO, a ROCO group wherein each R is a hydrogen atom or a C1-4 alkyl group;
• or two adjacent R1, when taken together, represent a —O—(CH2)m—O— group wherein m is 1 or 2, or form a C5-10 saturated or unsaturated ring optionally substituted by one or more than one hydroxyl group, one or more than one C1-3 alkyl group and/or one or more than one C1-3 alkoxy group;
• R2 represents a hydrogen atom, a C1-6 alkyl group or a C6-10 aromatic group optionally substituted by a hydroxyl group, a C1-3 alkyl group, a C1-3 alkoxy group, a RCOO or a ROCO group, wherein each R is, independently from each other, a hydrogen atom or a C1-4 alkyl group;
• b) a formate ester of formula
• wherein R3, R4 and R5 represent, simultaneously or independently, a hydrogen atom, or a C1-18 hydrocarbon group optionally comprising one to three oxygen atoms;
• or R3 and R4, represent, when taken together, a C3-18 hydrocarbon group optionally comprising one to three oxygen atoms;
• and
• c) an alcohol of formula
• wherein R3, R4 and R5 have the same meaning as defined above;
• wherein the precursor compound comprises a compound of formula (I)
• wherein n, R1, R2, R3, R4 and R5 have the same meaning as defined above;
• by exposing the precursor compound of formula (I) to ambient conditions in the absence of a catalyst, wherein the ambient conditions comprise room temperature, ambient air, and atmospheric pressure.