Formic Acid → 1-Methyl-5-nitroimidazole

Beteiligte Stoffe

Reaktionsschritte

202 parts of 5-nitroimidazole is dissolved in 600 parts of formic acid (90% by weight), 250 parts of dimethyl sulfate is added and the whole is heated for 6 hours. The formic acid is distilled off in vacuo. 420 parts of water is added to the residue, the whole cooled to from 0° to 5° C. and the unreacted 5-nitroimidazole (60 parts) is centrifuged off. The mixture is adjusted to pH 10 with aqueous ammonia solution (25% by weight) and the precipitate is separated at 0° to 5° C. 130 parts of 1-methyl-5-nitroimidazole having a melting point of 58° to 60° C. is obtained; this is equivalent to a yield of 82% of theory based on reacted 4(5)-nitroimidazole.

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