N-bromobutanimide → 5-(Bromomethyl)thiophene-2-carbonitrile

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A mixture of 5-methylthiophene-2-carbonitrile (9.9 g, 80.5 mmol), benzoylperoxide (0.23 g, 0.95 mmol), and N-bromosuccinimide (15 g, 84.3 mmol) in carbontetrachloride (200 mL) was heated at reflux for 6 h. The resulting suspension was filtered and the filtrate diluted with dichloromethane (400 mL), washed with a saturated sodium bicarbonate solution, dried over magnesium sulfate, and concentrated in vacuo. The residue was purified by column chromatography (EtOAc: n-hexane, 1:4) to give the title compound as a yellow oil (14.0 g, 86%).

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