Noncompetitive kinetic studies were made of the AlClpxtalyzed reaction of 2, 4- dichlorobenzoyl chloride with benzene and with toluene in nitromethane at 20" C. The reaction appears to follow the kinetic expression: rate=(k/[AlC13],)[ArH][acid chloride][AlC13]. The kT/kB= 472 84 and product isomer distributions (8.4* 0.3)% ortho,(0.43 0.02)% meta, and (91.2* 0.3)% para are in good agreement with the Brown selectivity ...