Formaldoxime is the organic compound with the formula . 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 (). It is a reagent in organic synthesis for the conversion of aryl diazonium salts to aryl aldehydes. It is an isomer of formamide.

It is generated by combining hydroxylamine and formaldehyde.

Synonyms Source: Formoxime Nitrone Formaldehyde oxime Formaldoxim Methylenenitrone

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