Reaction of 1,3- hydroxylamino oximes with formaldehyde,acetaldehyde, and acetone

The products of condensation of 1,3-hydroxylamino oximes with formaldehyde have 1-hydroxy-1,2,5,6-tetrahydropyrimidine 3-oxide (cyclic form) structures, the products of condensation with acetone have N-(3-oximino-substituted)-,-dimethylnitrone (open form) structures, and the products of condensation with acetaldehyde exist in solution in the form of a tautomeric mixture of the open and cyclic forms. The products of condensation of alkyl-aromatic 1,3-hydroxylamino oximes with acetaldehyde have N-(3-oximino-substituted)--nitrone (open form) structures.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 2, pp. 252–258, February, 1977.