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Abstract Elimination of the hydrazide group was studied with the model compounds N‐benzoyl‐glycine hydrazide and N‐benzoyl‐L‐phenylalanine hydrazide, using phosphorus oxychloride, hydrogen bromide or hydrogen chloride in acetic acid, or 60% perchloric acid. It was found that treatment of N‐benzoyl‐L‐phenylalanine hydrazide with perchloric acid gave N‐benzoyl‐L‐phenylalanine in 100% yield and without racemisation.
Schnyder et al. (1975) studied this question.
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