| 摘要 |
<p>Case 3796/ASC/db 9/27/76 PROCESS FOR DIRECTED CHLORINATION OF ALKYLBENZENES A process for the production of nuclear chlorinated alkylbenzenes comprises reacting, in the liquid phase, alkylbenzene with chlorine in the presence of a Lewis acid catalyst and a co-catalyst comprising a thianthrene compound or mixture of thianthrene compounds characterized by the formula: where each n is 0 to 1, each x is hydrogen or an electron-withdrawing substituent or an electron-donating substituent with the proviso that at least one x is an electron withdrawing substituent and at least one x is an electron-donating substituent. A preferred co-catalyst is dimethyldichlorothianthrene. The monochlorinated alkylbenzene products prepared in this manner are characterized by a desirably low ratio of ortho to para isomer.</p> |
