[EN] FRIEDEL-CRAFT PROCESS FOR THE PREPARATION OF THIOXANTHONES<br/>[FR] PROCEDE FRIEDEL-CRAFT POUR LA PREPARATION DE THIOXANTHONES
申请人:PROM LTD
公开号:WO2002040464A1
公开(公告)日:2002-05-23
This invention is directed to a process of preparing thioxanthones, represented by Formula 1, by a Friedel-Craft reaction giving higher yields and lower amount of waste, comprated to known processes. This invention also involves purification of the starting material, a 2-chlorothiobenzodyl chloride, by distillation.