Summary
For the osazone reaction of the reducing sugars, the following mechanism is suggested: the initially formed phenylhydrazone is converted with aniline into the N-glycoside. Aniline arises from disproportional decomposition of phenylhydrazine. The N-glycoside undergoes an Amadori-rearrangement to 1-deoxy-1-amino-2-ketose derivative. From this is formed the phenylhydrazone. The latter is converted by dehydrogenation and transamination into the phenylosazone.
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Micheel, F., Dijong, I. Über den Mechanismus der Osazonreaktion. Experientia 19, 338–339 (1963). https://doi.org/10.1007/BF02152304
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DOI: https://doi.org/10.1007/BF02152304