Abstract The dipole moments of halogen-derivatives of hinokitiol (4-isopropylcyc]oheptatriene-2,4, 6-ol-2-one-1) were measured in benzene solution at 25°. The values obtained are: β-monobromohinokitiol (3-bromo-), 4.40 D; α-monochlorohinokitiol (5-chloro-), 2.70 D; β-monochlorohinokitiol (7-chloro-), 4.38 D; γ-monochlorohinokitiol (3-chloro-), 4.74 D; α-dichlorohinokitiol (3,7-dichloro-), 4.46 D. By analysing the results obtained, the position of substituents in the halogenated hinokitiols were determined and are given immediately after each name of these compounds in parentheses.