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Untersuchungen in der Benztropylium‐Reihe. XIV. Identifizierung der Carbonylbande in den IR.‐Spektren des Tropons und seiner Benzologen
Author(s) -
Götz H.,
Heilbronner E.,
Katritzky A. R.,
Jones R. A.
Publication year - 1961
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.19610440207
Subject(s) - chemistry , tropone , methylene , solvent , infrared , carbon fibers , carbonyl group , crystallography , medicinal chemistry , organic chemistry , optics , physics , materials science , composite number , composite material
The solvent dependence of the frequencies of infrared absorption bands in the 1700–1600 cm −l region is used to identify the carbonyl stretching band of certain tropones. For tropone, 4,5‐benzotropone and 4,5‐(2′,3′‐naphtho)‐tropone the carbonyl stretching band is found to lie at lower frequencies (ca. 1600 cm −1 ) than the carbon‐carbon stretching frequencies. It is confirmed that whereas for 2,7‐polymethylene‐4,5‐benzotropones the carbon‐carbon stretching frequency lies at ca. 1620 cm −l , the carbonyl frequency decreases from ca. 1700 to ca. 1600 cm −l as the polymethylene chain increases in length, and occurs below the former for compounds with more than nine methylene groups.