中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
2,4,5-三氯苯酚 | 2,4,5-trichlorophenol | 95-95-4 | C6H3Cl3O | 197.448 |
A method has been developed for the synthesis of a new heterocyclic system III. When 2-β-chloroethoxybenzyl chloride (XI) was heated with thiourea in alcohol solution, S-(2-β-chloroethoxybenzyl)isothiuronium chloride (XII) was formed which on cleavage with aqueous alkali in high dilution yielded 2,3-dihydrobenzo(f)-1,4-oxathiepin (III). Derivatives of III with substituents such as methyl, t-butyl, chlorine, and nitro in the 7 and 9 positions were prepared in high yields from the corresponding substituted 2-β-chloroethoxybenzyl chlorides. The presence of substituents in the position ortho to the chloroethoxy group of XII had no retarding effect on the cyclization to XIV.