WE CLAIM:
[Claim 1]
A method for releasing an unsaturated aldehyde or ketone represented by the general formula (2) by irradiating the compound represented by the general formula (1) with light, in which the compound represented by the general formula (1) is used as a flavor or fragrance precursor: [Chem. 1]
7
wherein R1, R2, R3, R4, R5, R6, R7, and R8 each independently represent a hydrogen atom, an alkyl group which may have a substituent group, a cycloalkyl group which may have a substituent group, an alkenyl group which may have a substituent group, an aryl group which may have a substituent group, an aralkyl group which may have a substituent group, an aromatic heterocyclic group which may have a substituent group, an aliphatic heterocyclic group which may have a substituent group, an acyl group which may have a substituent group, or an alkoxycarbonyl group which may have a substituent group, R1 and R2, R1 and R3, R1 and R4, R1 and R5, R3 and R4, or R3 and R5 may together form a ring, and a wavy line expresses either one of E and Z geometric isomers or a mixture thereof, and: [Chem. 2]
wherein R1, R2, R3, R4, and a wavy line are the same as defined above for the general formula (1) and R1 and R2, R1 and R3, R1 and R4, or R3 and R4 may together form a ring. [Claim 2]

The method for releasing an unsaturated aldehyde or ketone according to claim 1, wherein a wavelength of the light used is 280 to 780 nm. [Claim 3]
The method for releasing an unsaturated aldehyde or ketone according to claim 1 or 2, wherein R1, R2, R3, R4, R5, R6, R7, and R8 are each independently a hydrogen atom or an alkyl group having 10 or less carbon atoms, which may have a substituent group. [Claim 4]
A flavor or fragrance composition comprising a compound represented by the general formula (1): [Chem. 3]
wherein R1, R2, R3, R4, R5, R6, R7, and R8 each independently represent a hydrogen atom, an alkyl group which may have a substituent group, a cycloalkyl group which may have a substituent group, an alkenyl group which may have a substituent group, an aryl
5 group which may have a substituent group, an aralkyl group which may have a substituent group, an aromatic heterocyclic group which may have a substituent group, an aliphatic heterocyclic group which may have a substituent group, an acyl group which may have a substituent group, or an alkoxycarbonyl group which may have a substituent group, R1 and R2, R1 and R3, R1 and R4, R1 and R5, R3 and R4, or R3 and R5 may together form a ring, and a
0 wavy line expresses either one of E and Z geometric isomers or a mixture thereof [Claim 5]
The flavor or fragrance composition according to claim 4, wherein R1, R2, R3, R4, R5, R6, R7, and R8 are each independently a hydrogen atom or an alkyl group having 10 or less carbon atoms, which may have a substituent group.
5 [Claim 6]
An aroma product, a laundry care product, a hair care product, a cosmetic, or a cleaner comprising a compound represented by the general formula (1): [Chem. 4]

wherein R1, R2, R3, R4, R5, R6, R7, and R8 each independently represent a hydrogen atom, an alkyl group which may have a substituent group, a cycloalkyl group which may have a substituent group, an alkenyl group which may have a substituent group, an aryl group which may have a substituent group, an aralkyl group which may have a substituent group, an aromatic heterocyclic group which may have a substituent group, an aliphatic heterocyclic group which may have a substituent group, an acyl group which may have a substituent group, or an alkoxycarbonyl group which may have a substituent group, R1 and R2, R1 and R3, R1 and R4, R1 and R5, R3 and R4, or R3 and R5 may together form a ring, and a wavy line expresses either one of E and Z geometric isomers, or a mixture thereof. [Claim 7]
The aroma product, the laundry care product, the hair care product, the cosmetic, or the cleaner according to claim 6, wherein R1, R2, R3, R4, R5, R6, R7, and R8 are each independently a hydrogen atom or an alkyl group having 10 or less carbon atoms, which may have a substituent group.