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ON THE MECHANISM OF THE CONVERSION OF 6-CHLOROPYRIDO (2,3-B) PYRAZINE INTO IH-IMIDAZO (4,5)-B PYRIDINE BY POTASSIUM AMIDE IN LIQUID AMMONIA(1,2)NAGEL A; VAN DER PLAS HC; GEURTSEN G et al.1979; J. HETEROCYCL. CHEM.; USA; DA. 1979; VOL. 16; NO 2; PP. 305-309; BIBL. 16 REF.Article

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