Abstract
THE optical activity of asymmetric molecules has frequently been used as a criterion of purity and also a means of identification of naturally occurring chemical compounds. In this laboratory we are particularly interested in the anteiso series of fatty acids found in natural fats1,2. These optically active fatty acids were recently synthesized in a high state of purity by Milburn and Truter3 and the optical rotations of this homologous series are therefore available to test Tschugaeff's rule4. According to this the specific rotations of members of a homologous series are inversely proportional to the molecular weights within certain limits, and the molecular rotations are constant within wide limits, that is, the molecular rotations are independent of the molecular weights.
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