标题：Studies on the Syntheses of Isoquinoline Derivatives and their Analogs. XXXV. Migration of the Double Bond of Pyrimidinoisoquinolines and presumption of their Structures by the Infrared Absorption Spectra
摘要：In the preceding paper it was shown that two kinds of pyrimidinoisoquinoline of a higher and lower melting point were obtained by the cyclization of N-(p-nitrobenzoyl-β-alanyl)-β-3, 4-dimethoxyethylamine. Later, the structure of two were examined through the infrared spectra and some conclusions were drawn from them. A newer method for their mutual transformation method was found and successfully achieved by boiling the lower-melting substance with 10% hydrochloric acid. Furthermore, the same reaction was found to occur between compounds having no nitro group.
