Oximes by exchange

Hershberg developed an efficient method for the regeneration of ketones from their semicarbazones, phenylhydrazones, or oximes by exchange reaction. As applied to androstenolone acetate semicarbazone, the reaction is conducted in the presence of sodium acetate both to avoid deacetylation and to keep the exchanged semicarbazone in solution when the mixture is diluted with water. Thus 10 g. of pure... 

Ketones can be recovered in acceptable yields from hydrazones and oximes by exchange with acetone in a sealed tube at 50-80° (c/. Pyruvic acid, 1, 974). ... 

Regeneration of ketones from tosylhydrazones, aryl hydrozones, and oximes by exchange with acetone. 

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