Imidazole, 5-(2-chloroethyl)-1-methyl-2-nitro- → 1-ME-2-NO2-5-Vinyl imidazole

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To a solution of 18.9 g. of 5-(2-chloroethyl)-1-methyl-2-nitroimidazole (prepared according to the procedure of British Pat. No. 1,222,486) in 2.8 liters of anhydrous benzene cooled to 5°-10° C., 16.8 g. of potassium tert-butoxide is added. Stirring is continued for 2 hours at 5°-10° C. After filtration and concentration to dryness under vacuum at a temperature lower than 50° C., the resulting yellow oily residue is washed three times with 50 ml. of ethyl ether (or light petroleum). The title product is obtained, which is dried under vacuum at 40° C.; yield 12 g. (77.7%). A sample crystallized from ethyl ether melts at 106°-108° C.

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