1-Cyanoformidic acid hydrazide

Triethyl orthoformate 1-Cyanoformidic acid hydrazide Triethylamine... 

A mixture of triethyl orthoformate (150 ml) and 1-cyanoformidic acid hydrazide, K. Matsuda and L. T. Morin, J. Org. Chem., 26 3783 (1961), (25.2 g, 0.30 mol) was cooled to 0°C and a solution (4.0 ml) of dioxane saturated with anhydrous hydrogen chloride was added with stirring. The mixture was stirred with cooling in an ice bath for 5 hours and stirring at 25°C was continued for 15 hours. The mixture was evaporated to dryness and ether... 

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