Pyrazine, 2,5-dimethyl-3,6-diphenyl nitration

Imidazolidine, 4,5-dichloro-l,3-diacetyl-imidazo[4,5-6]pyrazine synthesis from, 5, 646 Imidazolidine, 1,3-dimethyl-conformation, 5, 355 Imidazolidine, diphenyl-dehydrogenation, 5, 427 Imidazolidine, 2-imino-1-substituted nitration, 5, 427... 

Reactions of Imidazoles. Thermolysis of 1-triphenylmethylimidazole results in migration of the imidazolyl group to yield compound (286). Sensitized photo-oxygenation of 4,5-diphenylimidazole in methanol affords a mixture of the imidazolinone (287) and the imidazolidinone (288). The imidazole (289 R = H) undergoes lithiation at C-5 subsequent treatment with diphenyl disulphide gives the di(phenylthio)-derivative (289 R = PhS). Copyrolysis of 2,4-dimethylimidazole and chloroform results in a complex mixture, containing imidazole and methyl-, dimethyl-, and chloromethyl-pyrimidines and -pyrazines. The confusion about the structures of N-methyl derivatives of iodo-nitro-imidazoles has been cleared up the supposed 1-methyl-2,5-di-iodoimidazole is actually the 4,5-di-iodo-compound it yields 4-iodo-l-methyl-5-nitroimidazole on nitration. The reaction of the bromo-... 

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