March, D. M.; Henshall, T. published an article in 1962, the title of the article was The kinetics of cyclization of some 2,2′-diphenic acids in sulfuric acid.SDS of cas: 93012-36-3 And the article contains the following content:
A spectrophotometric method of analysis was used. Simple first-order kinetics were found in each case, and also a linear dependence of log k on the Hammett acidity function. The energy and entropy parameters were found to vary in a characteristic manner. A mechanism is proposed and is discussed. The experimental process involved the reaction of 5,5′-Dimethyl-[1,1′-biphenyl]-2,2′-dicarboxylic acid(cas: 93012-36-3).SDS of cas: 93012-36-3
5,5′-Dimethyl-[1,1′-biphenyl]-2,2′-dicarboxylic acid(cas:93012-36-3) belongs to chlorides. Alkanes and aryl alkanes may be chlorinated under free radical conditions, with UV light. However, the extent of chlorination is difficult to control. Aryl chlorides may be prepared by the Friedel-Crafts halogenation, using chlorine and a Lewis acid catalyst. SDS of cas: 93012-36-3
Referemce:
Chloride – Wikipedia,
Chlorides – an overview | ScienceDirect Topics