Diphenyldichloromethane

Diphenyldichloromethane is an organic compound with the formula (C6H5)2CCl2. It is a colorless solid that is used as a precursor to other organic compounds.
Synthesis.
It is prepared from carbon tetrachloride and anhydrous aluminium chloride as catalyst in a double Friedel-Crafts alkylation of benzene. Alternatively,
benzophenone is treated with phosphorus pentachloride: 
Reactions.
It undergoes hydrolysis to benzophenone.
It is used in the synthesis of tetraphenylethylene, 
diphenylmethane imine hydrochloride and benzoic anhydride.