Infrared Spectra of Troponoid Compounds. III. Tropolone and 2-Deuteroxytropone

In order to find infrared absorption of tropolone, especially the absorption that can be assigned to the C–O–H group, the spectrum of 2-deuteroxytropone was measured and there were discussions chiefly on absorptions in the finger-print region. The absorption bands at around 3150, 1490, 1267 and 726 cm−1 were assigned to the vibration of C–O–H group. In this connection, some mention was made on deuterated tropolone and considerations were made on the assignment of vibrational spectra of tropolone, as summarized in Table II.