4-Ethylbenzoic Acid → (5-Bromo-2-chloro-4-methoxyphenyl)(4-ethylphenyl)methanone

Participants

Reaction Steps

To a solution of 4-ethyl benzoic acid (AQ) (0.50 g, 3.33 mmol) in dry dichloromethane (20 mL) was added dropwise oxalyl chloride (0.32 mL, 3.68 mmol) followed by N,N-dimethylformamide (0.1 mL). After being stirred for 2 h at room temperature, the reaction mixture was evaporated and the residue was dissolved in dry dichloromethane (20 mL) at room temperature under agron. After cooling to −5° C., 1-bromo-4-chloro-2-methoxybenzene (0.6 g, 2.78 mmol) was added. Then AlCl3 (0.43 g, 3.33 mmol) was added portionwise and the reaction temperature was kept between −5° C. and 0° C. After being stirred at room temperature for four hours, the reaction mixture was poured onto ice water and extracted with dichloromethane (80 mL). The combined organic layers were washed with 1 M HCl (10 mL), water (10 mL) and brine (10 mL), and then dried over anhydrous Na2SO4 Concentration under reduced pressure gave AR as a white solid. Yield: 0.5 g (52.3%). 1H-NMR (CDCl3, 400 MHz): δ 7.75 (d, J=8.4 Hz, 2H), 7.60 (s, 1H), 7.32 (d, J=8.0 Hz, 2H), 6.98 (s, 1H), 3.99 (s, 3H), 2.76 (q, J=7.5 Hz, 2H), 1.29 (t, J=7.5 Hz, 3H).

Provenance & Evidence