| 摘要 |
<p>of the disclosure: In the ring chlorination of toluene, a particularly high proportion of p-chlorotoluene is obtained by using in addition to the customary Lewis acid catalysts as cocatalyst a chlorination product of 2,8-dimethylphenoxathiin which comprises in the main 1,3,7,9 tetrachloro-2,8-di-methylphenoxathiin of the formula </p> |
