Syntesis of 2- and 3-chloro-1,4-dihydroxythioxanthen-9-ones
摘要:
1,4-dihydroxythioxanthen-9-one was for the first time subjected to regioselective chlorination into 2-chloro-1,4-dihydroxythioxanthen-9-one effected by SOCl(2) at room temperature. The hydrochlorination of thioxanthen-1,4,9-trione led to the formation of 2- and 3-chloro-1,4-dihydroxythioxanthene-9-ones with the 3-isomer prevailing.