Triphenylmethane and derivatives

FRIEDEL-CRAFTS REACTION. Aluminum chloride anhydrous, introduced by Friedcl and Crafts, is used as reagent, generally in CS solution to avoid rise in temperature, for the preparation of (I) aryl-alkyl hydrocarbons, (2) di- and triphenylmethane and derivatives, and (3) aryl-alkyl and diaryl ketones, Other chlorides, such as those of zinc, irun(lll), and liniiV), are often effective in certain cases. 

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