N-bromobutanimide → 5-Bromomethyl-N-(1,1-dimethylethyl)-2-methoxybenzenesulfonamide

Participants

Reaction Steps

A mixture of 27 g of N-(1,1-dimethylethyl)-2-methoxy-5-methylbenzenesulfonamide (E. H. Huntress and F. H. Carten, J. Am. Chem. Soc., 62 (1940), 603), 19.6 g NBS and 0.3 g azobisisobutyronitrile in 200 ml CH2Cl2 was refluxed and illuminated with a sun lamp. After 8 hours the lamp was turned off and the reaction was refluxed for another 24 hr. The reaction was allowed to cool. The reaction mixture was washed with 200 ml of a 1:1:1:1 mixture of brine:sodium sulfite-sodium bicarbonate-water. The organic layer was dried (MgSO4), treated with charcoal and filtered through a 5 g plug of silica gel. The plug was washed with 100 ml of chloroform. The combined organic fractions were evaporated to give 34 g of solid, m.p. 137°-142° C.;

Provenance & Evidence