反应详情

A suspension of 2-amino-5-nitrobenzaldehyde (6.0 g.) in ethanol (250 ml.) was stirred at ambient temperature while sodium borohydride (1.6 g.) was added in small portions, and the reaction mixture was stirred for 1 hour. The reaction mixture was made acid with 2 N hydrochloric acid to destroy the excess of sodium borohydride, and then basified to pH 8 to 9 with solid sodium carbonate and extracted with diethyl ether (3×200 ml.). The extracts were combined and dried, the solvent was evaporated and the residue was crystallised from water (about 200 ml.) to give the required 2-amino-5-nitrobenzyl alcohol, m.p. 141°-142° C.;

1. additionwas added in small portions
2. customto destroy the excess of sodium borohydride
3. extractionextracted with diethyl ether (3×200 ml.)
4. customdried
5. customthe solvent was evaporated
6. customthe residue was crystallised from water (about 200 ml.)