Abstract
Cyclopropylamine is an amine with a strong ring strain and a higher acidity than its open-chain analogue n-propylamine. Using the frequency shifts of the symmetric NH 2 stretching vibration on condensation as a measure of hydrogen bond strength, the two amines agree in their association to a first approximation. However, the shifts corrected for Fermi resonance suggest a slightly weaker interaction of the cyclic compound owing to reduced acceptor ability or steric factors. An adequate result had been obtained in studies of the NH 2/ND 2 vapour pressure isotope effect of the two amines.
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