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3. Chemistry of Heterocyclic Compounds
4. Studies on Imidazoles. II. The Synthesis of 5-Imidazolecarboxylates from Glycine and Substituted Glycine Esters
5. Note added in proof: The evidence that the compound is S-ethyl and not N-ethyl is given by the fact that it fails to give the typical yellow colour with sulphur dioxide (4 p. 85) and by its basic character as could be shown by the isolation of a crystalline hydrochloride, m.p. 102-104°. (No hydrochloride could be obtained from ethyl 1-methyl-2-thio-5-imidazole carboxylate). While no odour is discernable when 1-methyl-2-thio-5-imidazole carboxylic acid is heated with solid sodium hydroxide, a mercaptan odour is noticed when the analogous 2-ethylthio-acid is treated in the same manner.