| abstract |
(57) Abstract: A compound represented by the general formula (II), which is useful as a developer of a leuco dye used in thermal paper, has a productivity: Provided is a production method which is economical and safe and can supply raw materials stably. SOLUTION: The production time is shortened by using an alkyl iodide represented by the general formula (I) having a higher reactivity than the conventionally used alkyl bromide, and furthermore, iodine is recovered from production wastewater to act on alcohol. By incorporating an iodine recovery process for producing alkyl iodide by itself into the production process, iodine could be completely recovered and reused, and the productivity, economy and safety could be improved as compared with the conventional method. [Formula 1] [Formula 2] |