Synthesis of 2,5′-bipyrimidines from substituted 5-cyanopyrimidines

✍ Scribed by V. P. Mamaev; M. A. Mikhaleva; A. I. Shadrina

• Publisher: Springer US
• Year: 1988
• Tongue: English
• Weight: 475 KB
• Volume: 24
• Category: Article
• ISSN: 0009-3122
• DOI: 10.1007/bf00475329

✦ Synopsis

The 20a, 13, 9a, I, 3, 18b, 10b, and 4 vibrations display variable distinctive character. For example, the 20a, i, 3, and 4 vibrations are characteristic in the case of 2-monosubstitution [2] and noncharacteristic in the case of 5-substitution, while the 13, 9a, 18b, and 10b vibrations, which are noncharacteristic in the case of 2-substitution, become characteristic in 5-monopyrimidines. It is precisely owing to these vibrations that one can distinguish the spectra of 2-and 5-monosubstituted pyrimidines from one another. However, the most characteristic feature of the spectra of 5-monosubstituted pyrimidines is the absence in them of an intense band at -980 cm -I in the Raman spectra, which was validly pointed out in [4]. Another difference between the spectra of 5-monosubstituted pyrimidines and 2-monosubstituted pyrimidines is the appearance of an intense band at 1170 cm -I in the IR spectra. i. V 2. V 3. S 4. I 5. O 6. A 7. M 8. 9.