Derivatives of the parent structure H2N+(O-)OH, (GNOC Recom. R-5.3.2) of which the alkylidene derivatives, R2C=N+(O-)OH (tautomers of nitroalkanes), are the most commonly encountered. The alkylideneazinic acids are known as nitronic acids or, synonymously as aci-nitro compounds. E.g. CH2=N+(O-)OH methylideneazinic a
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