Method for producing a 5-bromo-1-pentanal compound or an acetal derivative thereof.

摘要

A 5-bromo-l-pentanal compound of the formula (I): wherein R<1> and R<2> respectively represent, independently from each other, a member selected from the group consisting of a hydrogen atom and alkyl radicals having l to 7 carbon atoms, or an acetal derivative of said 5-bromo-l-pentanal compound, is produced by subjecting a starting compound selected from the group consisting of 4-pentenal compounds of the formula (II): wherein R<1> and R<2> are as defined above, and acetal derivatives of the above-mentioned compounds, to a free radical addition reaction with hydrogen bromide in a liquid medium at a temperature of l0 DEG C to 60 DEG C; in the presence of a free radical initiator or by irradiating ultraviolet rays to the reaction mixture, and by collecting the resultant reaction product from the reaction mixture.