When a dilute solution of 6-phenylhexanoyl chloride in carbon disulfide was slowly added (...

When a dilute solution of 6-phenylhexanoyl chloride in carbon disulfide was slowly added (over a period of eight days!) to a suspension of aluminum chloride in the same solvent, it yielded a product A (C12H14O) in 67% yield. Oxidation of A gave benzene-1,2-dicarboxylic acid.

Formulate a reasonable structure for compound A.