Abstract
Infrared absorptions in the region of 700-1000cm-1 were examined in 16 kinds of 1, 3-cyclohexanedione derivatives. Of the three absorptions bands in 1, 3-cyclohexanedione (I) of ν1 at 1212, ν2 at 1180, and ν3 at 1141cm-1, the band corresponding to ν3 is lacking in the 4-substituted compound, while that in the 5-substituted compound shifts to a higher wave-number and overlaps with the ν1 band. Assignments listed in Table II were made from the behaviour of these bands to deuteration.
The intensity of these bands decreases in 2-carbonylated compounds and a few bands of strong intensity appeared in its stead in the region of 1000-1100cm-1.
