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].
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Morgan et al. (1934) studied this question.
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