Patent ID: 7615650

Claim:
A process for producing a chroman compound represented by formula (1): [F1] (wherein each of substituents R 1 to R 4 represents a hydrogen atom, a halogen atom, a hydroxyl group, a methoxy group, an ethoxy group, a carboxyl group, a C1 to C12 alkyl group which may have a substituent, a C6 to 012 aryl group which may have a substituent, a C7 to C12 aralkyl group which may have a substituent, or an ester residue; R 1 to R 4 may be linked to one another; each of R 5 to R 6 represents a hydrogen atom or a C1 to C12 alkyl group, and X represents a hydrogen atom, a carboxyl group, an amide group, a nitrile group, an aldehyde group, an ester group and a C1 to C12 alkyl group which may have a substituent, the substituent represents a halogen atom, a hydroxyl group, a carboxyl group or an ester group, characterized in that the process comprises allowing a phenol represented by formula (2): (wherein each of R 1 to R 4 represents as same as those of formula (1)), an unsaturated compound represented by formula (3): (wherein R 5 , R 6 and X represent as same as those of formula (1)) and a formaldehyde to react in the absence of catalyst and in the presence of water in an amount by mole 1 to 10 times that of the phenol.