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; R 1, simultaneously or independently, represents at least one substituent of the aromatic ring and are a hydroxyl group, a C 1-6 alkyl group, a C 1-6 alkoxy group or a RCOO, a ROCO group wherein R is a hydrogen atom or a C 1-4 alkyl group; or two adjacent R 1, when taken together, represent a -O-(CH 2) m -O-wherein m is 1 or 2 or form a C 5-10 saturated or unsaturated ring optionally substituted by one or more than one hydroxyl group, one or more than one C 1-3 alkyl group and/or one or more than one C 1-3 alkoxy group; R 2 represents a hydrogen atom, a C 1-6 alkyl group or a C 6-10 aromatic group optionally substituted by a hydroxyl group, a C 1-3 alkyl group, a C 1-3 alkoxy group, a RCOO or a ROCO group wherein R is, independently from each other, a hydrogen atom or a C 1-4 alkyl group; b) a formate ester of formula wherein R 3, R 4 and R 5 represent, simultaneously or independently, a hydrogen atom, or a C 1-18 hydrocarbon group optionally comprising one to three oxygen atoms; or R 3 and R 4, represent, when taken together, a C 3-18 hydrocarbon group optionally comprising one to three oxygen atoms; and c) an alcohol of formula wherein R 3, R 4 and R 5 have the same meaning as defined above; wherein the precursor compound comprises a compound of formula; wherein n, R 1, R 2, R 3, R 4 and R 5 have the same meaning as defined above; by exposing the precursor compound of formula to ambient conditions. a) a ketone or aldehyde of formula wherein n represent an integer between 0 and 5; R 1, simultaneously or independently, represents at least one substituent of the aromatic ring and are a hydroxyl group, a C 1-6 alkyl group, a C 1-6 alkoxy group or a RCOO, a ROCO group wherein R is a hydrogen atom or a C 1-4 alkyl group; or two adjacent R 1, when taken together, represent a -O-(CH 2) m -O-wherein m is 1 or 2 or form a C 5-10 saturated or unsaturated ring optionally substituted by one or more than one hydroxyl group, one or more than one C 1-3 alkyl group and/or one or more than one C 1-3 alkoxy group; R 2 represents a hydrogen atom, a C 1-6 alkyl group or a C 6-10 aromatic group optionally substituted by a hydroxyl group, a C 1-3 alkyl group, a C 1-3 alkoxy group, a RCOO or a ROCO group wherein R is, independently from each other, a hydrogen atom or a C 1-4 alkyl group; wherein n represent an integer between 0 and 5; R 1, simultaneously or independently, represents at least one substituent of the aromatic ring and are a hydroxyl group, a C 1-6 alkyl group, a C 1-6 alkoxy group or a RCOO, a ROCO group wherein R is a hydrogen atom or a C 1-4 alkyl group; or two adjacent R 1, when taken together, represent a -O-(CH 2) m -O-wherein m is 1 or 2 or form a C 5-10 saturated or unsaturated ring optionally substituted by one or more than one hydroxyl group, one or more than one C 1-3 alkyl group and/or one or more than one C 1-3 alkoxy group; R 2 represents a hydrogen atom, a C 1-6 alkyl group or a C 6-10 aromatic group optionally substituted by a hydroxyl group, a C 1-3 alkyl group, a C 1-3 alkoxy group, a RCOO or a ROCO group wherein R is, independently from each other, a hydrogen atom or a C 1-4 alkyl group; b) a formate ester of formula wherein R 3, R 4 and R 5 represent, simultaneously or independently, a hydrogen atom, or a C 1-18 hydrocarbon group optionally comprising one to three oxygen atoms; or R 3 and R 4, represent, when taken together, a C 3-18 hydrocarbon group optionally comprising one to three oxygen atoms; and c) an alcohol of formula wherein R 3, R 4 and R 5 have the same meaning as defined above; wherein the precursor compound comprises a compound of formula; wherein n, R 1, R 2, R 3, R 4 and R 5 have the same meaning as defined above; by exposing the precursor compound of formula to ambient conditions. wherein R 3, R 4 and R 5 have the same meaning as defined above; wherein the precursor compound comprises a compound of formula; wherein n, R 1, R 2, R 3, R 4 and R 5 have the same meaning as defined above; by exposing the precursor compound of formula to ambient conditions.