Correlations of the infrared spectra of some pyridines

摘要: The spectra of pyridine and 33 substituted pyridines are compared to establish correlations the absorption bands with molecular structure compounds. Five groups compounds considered, namely, 2-, 3- 4-monosubstituted, di- tri-substituted types. Absorption that generally characteristic an alkylpyridine system found near 1600, 1570 1000 cm/sup -1/. For 3-alkylpyridines 2,5-dialkylpyridines, latter peak is removed 1021 1034 Peaks in regions 1280 1330 -1/ 1222 1253 strong confirmatory evidence for system. separation 1600 approximately 40 4-monoalkylpyridines 20 other two types monosubstituted pyridines. 4-monosubstituted also have a band region 1067 1072 2-monosubstituted at 1050 1146 1152 3-monosubstituted 1117 1131 1180 1196 Disubstituted all 1099 1136 No were this formore » trisubstituted Out-of-plane deformation vibrations 2-monoalkylpyridines 743 750 -1/; 3-monoalkylpyridines 789 810 712 715 785 822 disubstituted 816 833 725 724 732 monoalkylpyridines relative intensity location 1667 2080 differ only if position substitution differs. Typical patterns given 4-monoalkylpyridines. Patterns suggested 2,3-, 2,4-, 2,5- 2,6-disubstituted pyridines.« less