Dimethylformamide → 2-(3,4-Dichlorophenyl)pent-4-enoyl chloride

Participants

Reaction Steps

To a soln of 2-(3,4-dichlorophenyl)pent-4-enoic acid (2.34 g, 9.53 mmol) in methylene chloride (25.0 mL) was added oxalyl chloride (1.61 mL, 19.0 mmol) followed by N,N-dimethylformamide (73.8 uL, 0.953 mmol) After 1 hr of stirring at rt, the solution was concentrated to provide 2-(3,4-dichlorophenyl)pent-4-enoyl chloride as a yellow oil (2.70 g, quantitative). 1H NMR (400 MHz, CDCl3) δ 7.49-7.42 (d, J=8.3 Hz, 1H), 7.40-7.36 (d, J=2.2 Hz, 1H), 7.17-7.10 (dd, J=8.3, 2.2 Hz, 1H), 5.73-5.57 (ddt, J=17.1, 10.2, 6.9 Hz, 1H), 5.15-5.06 (m, 2H), 4.06-3.97 (t, J=7.6 Hz, 1H), 2.97-2.83 (m, 1H), 2.61-2.49 (m, 1H).

Provenance & Evidence