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1-Substituted-1-nitroso-3-nitroguanidines on treatment with aqueous potassium hydroxide solution give diazohydrocarbons. This method has been used to prepare diazomethane, diazoethane, diazo-n-propane, diazo-n-butane, diazo-n-pentane, and phenyldiazomethane. Potassium nitrocyanamide has been isolated as a by-product of this reaction.
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McKay et al. (1950) studied this question.
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