文章基本信息

标题：Studies on the Infrared Spectra of Heterocyclic Compounds. I. Infrared Spectra of Alkylpyridines
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作者：Hideyo Shindo ; Nobuo Ikekawa
期刊名称：Chemical and Pharmaceutical Bulletin
印刷版ISSN：0009-2363
电子版ISSN：1347-5223
出版年度：1956
卷号：4
期号：3
页码：192-197
DOI：10.1248/cpb1953.4.192
出版社：The Pharmaceutical Society of Japan
摘要：The infrared spectra of eight ethylpyridines and nineteen methylpyridines were determined. The absorption spectra obtained are correlated with their structures and are discussed on the characteristic properties of the pyridine ring and its similarity to the benzene ring. The conclusion are as follows : (i) Out-of-plane C-H deformation frequencies in alkylpyridines are determined principally by the number of adjacent free hydrogen atoms round the ring in a similar way to substituted benzenes, (ii) furthermore, their exact frequencies have a distinct correlation with the arrangement of hydrogen atoms round the ring, (iii) ethylpyridines always absorb at higher frequencies than those of the corresponding methyl homologs, and (iv) pyridine ring vibrations between 1450 and 1650 cm^-1 are also regularly correlated to the structures.