4-Methoxybenzophenone → 4,4'-Dimethoxybenzopinacol

Participants

Reaction Steps

To a one neck, one liter round bottom glass flask equipped with a stirrer and condenser was charged 10 g of 4-methoxybenzophenone, 300 cc of isopropanol, and 1 drop of glacial acetic acid. The solution was exposed to radiation through the flask wall for 140 hours from a 275 watt U.V. sunlamp situated 4 inches from the side of the flask. The solvent was stripped off under vacuum and the residue crystallized from ethyl alcohol to give 4,4'-dimethoxybenzopinacol with, after drying, a melting point of 163°-165° C.

Provenance & Evidence