| abstract |
A process for producing semicarbazide which comprises reacting a compound of formula (I) with ammonia in the absence or presence of a catalyst comprising a chloride, hydroxide, sulfate, carbonate, acetate, salicylate, amine complex or ethylenediamine complex of zinc or cadmium, or a mixture thereof. This process is advantageous in that it is free from the problem of the use of a large amount of sodium hydroxide and the generation of by-product sodium carbonate. <CHEM> |