Benzene → (2,3-Dimethylphenyl)(phenyl)methanone

To a stirred solution of 2,3-dimethylbenzoyl chloride (35 g, 208 mmol) at 0° in dry dichloroethane (80 ml) was added anhydrous aluminium chloride (27.7 g, 208 mmol) portionwise over two minutes. The mixture was stirred for fifteen minutes and dry benzene (40 ml) was added. After warming to room temperature over fifteen minutes, the mixture was heated to reflux for four hours. The dark solution was cooled, poured onto ice (200 ml) containing concentrated hydrochloric acid (20 ml) and extracted with ether (3×100 ml). The combined organic layers were washed with 10% sodium hydroxide (2×50 ml), 10% sodium carbonate (50 ml) and brine (50 ml). After drying the organic layer over sodium sulphate, the solvent was removed under reduced pressure and the red oil (36 g) so obtained was chromatographed (SiO2 (400 g) using petroleum ether (60°-80°) and chloroform (0-12%) as eluent). This gave the desired 1-benzoyl-2,3 -dimethylbenzene (18.2 g, 42%).

1. temperaturethe mixture was heated
2. temperatureto reflux for four hours
3. temperatureThe dark solution was cooled
4. additionpoured onto ice (200 ml)
5. extractionextracted with ether (3×100 ml)
6. washThe combined organic layers were washed with 10% sodium hydroxide (2×50 ml), 10% sodium carbonate (50 ml) and brine (50 ml)
7. dry with materialAfter drying the organic layer over sodium sulphate
8. customthe solvent was removed under reduced pressure

ORD record

ord-d07f1fec069a4225a077c5036052e037

Source dataset

uspto-grants-1985_10

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US04548948