Optically active chrysanthemic acid or its derivatives of the formula
(wherein X represents a hydroxyl group, a halogen atom, a C₁₋₂₀ alkoxy group or a 2,2-dimethyl-3-isobutenyl-cyclopropane carboxyl group and * mark shows asymmetric carbon atom) is racemized by allowing it to react with a bromine compound or a SH compound, in the presence of light.
光学活性
菊酸或其衍
生物,其式为
(其中 X 代表羟基、卤素原子、C₁₋₂₀烷
氧基或
2,2-二甲基-3-
异丁烯基
环丙烷羧基,* 标记表示不对称
碳原子)在光照下与
溴化合物或 SH 化合物反应,使其发生外消旋化。