Formaldoxime

Formaldoxime is the organic compound with the formula H2C\dN\sOH. It is the oxime of formaldehyde. A colorless liquid, the pure compound tends to polymerize into a cyclic trimer. Aqueous solutions are stable as is the formaldoxime hydrochloride ([H2C\dN(\sH)(\sOH)]+Cl−). It is a reagent in organic synthesis for the conversion of aryl diazonium salts to aryl aldehydes.

It is generated by combining hydroxylamine and formaldehyde.