Ultrasonic absorption peaks were observed in liquid 2,3-dimethylbutane, 2-methylpentane, and in 3-methylpentane in the frequency range 3 mc to 35 mc. The mechanism of absorption can be explained in terms of hindered rotation about the middle C–C bond in 2,3-dimethylbutane and about the second and third C–C bond in pentanes. The energy differences between potential minima were found to be about 0.95 kcal/mole in all three liquids. The activation energy of 2-methylpentane was found to be about 3.9 kcal/mole.
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Chen et al. (1959) studied this question.
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