Methyl carbazate → 4-(3,5-Dichlorophenyl)-1-(methoxycarbonyl)semicarbazide

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Reaction Steps

3,5-Dichlorophenyl isocyanate (25 g, 133 mmol) was added dropwise to a cooled solution of methyl hydrazinocarboxylate (12 g, 133 mmol) in dry toluene (250 ml), with the temperature in the reaction flask maintained below 10° C. during the addition. After 28 h at RT, the precipitate was filtered, washed with toluene and isopropyl ether, and dried to yield the above compound as a white solid (30.3 g, mp=246° C.).

Provenance & Evidence