Bulletin of the Chemical Society of Japan
Online ISSN : 1348-0634
Print ISSN : 0009-2673
ISSN-L : 0009-2673
Quantum Mechanical Resonance and Internal Rotation
San-ichiro MizushimaMasaji Kubo
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1938 Volume 13 Issue 1 Pages 174-181


The effect of single bond—double bond resonance upon the internal rotation was discussed for carboxylic and their derivatives. In acids and ester the strong carboxylic resonance imparts the double bond character to the C–O bond the actual “mesomeric” molecule to such an extent that practically the complete inhibition of the internal motion is realized at all ordinary temperatures, while the replacement of hydrogen of H–COOR by chlorine or methoxyl group greatly reduces this double bond character, so that the internal oscillatory rotation of finite amplitude can take place about the C–O bond as axis.

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