N-bromobutanimide → HCID 15220187, compound

Participants

Reaction Steps

A mixture of 20.0 g (65 mmol) of 4-chloro-5-difluoromethoxy-3-(4-chloro-3-methylphenyl)-1-methyl-1H-pyrazole (prepared as described in Example 2), 17.4 g (98 mmol) of N-bromosuccinimide and 200 ml of carbon tetrachloride was refluxed for 3 h under irradiation with a UV lamp. The solid constituents were then filtered off and were washed with a little methylene chloride. The solvent was removed under reduced pressure, and then the residue was purified by chromatography on silica gel (eluent: methylene chloride/hexane=8:2). Yield: 11.0 g; 1H-NMR (270 MHz, in CDCl3); δ [ppm]=7.98 (s, 1H), 7.80 (d, 1H), 7.46 (d, 1H), 6.70 (t, 1H), 4.64 (s, 2H), 3.87 (s, 3H).

Provenance & Evidence