Abstract
Ultrasonic and 13C N.M.R. data are reported for 1-octanol, 2-octanol, 2,3-dimethyl-3-hexanol and 2,4-dimethyl-3-hexanol. The ultrasonic relaxation data indicate that in 1- and 2-octanol the observed dispersion can be attributed to hydrogen bond exchange processes associated with structural relaxation of the liquid. For 2,3-dimethyl-3-hexanol and 2,4-dimethyl-3-hexanol, an additional contribution associated with internal rotational relaxational processes has been detected. Assignments of the observed 13C spectra are compared with the predictions of the theory developed by Grant and Paul. Activation parameters obtained from the 13C and ultrasonic studies are compared with those obtained from the temperature dependence of viscous flow. The conformational changes are discussed in terms of the effects of steric and polar contributions to the internal rotational potential.
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