Patent ID: 8859803

Claim:
A method of producing a ketomalonic acid compound represented by following general formula (2): (wherein R 1 may be the same or different from each other and represents a hydrogen atom, an alkyl group which may be substituted with, a cyclic alkyl group which may be substituted with, an aromatic hydrocarbon group which may have a substituent, or an aromatic heterocyclic group which may have a substituent, and the two R 1 s may bind to each other to form a cyclic structure as a whole molecule) or a hydrate thereof, by reacting a malonic acid compound represented by following general formula (1): (wherein R 1 is the same as described above) or a mixture thereof, with one or two or more chlorous acid compounds selected from a chlorous acid or a salt of chlorous acid, to oxidize the malonic acid compound.