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THE reaction of acetylated glucosamine with p-dimethylaminobenzaldehyde was first observed by Muller 1901 who showed that after warming a solution of penta-acetylglucosamine with dilute potassium hydroxide an intense reddish- purple colour was produced by the addition of a solution of p-dimethylamino- benzaldehyde acidified with hydrochloric acid Ehrlich's reagent; 1901.
Morgan et al. (Mon,) studied this question.