Abstract
Molecular refractions were determined for a number of terpenes and related compounds. Wherever optical exaltation occurred it was correlated with the structural configurations of the respective compounds. Optical isomers gave identical values while geometric isomers differed, with the trans-form giving the higher value. Isolated double bonds did not cause exaltation, but conjugated double bonds definitely increased the molecular refraction. This was particularly marked when an exocyclic bond was conjugated with one within the cycle. A double bond in conjugation with a three membered cycle gave higher exaltation than one in conjugation with a four membered cycle. The unique influence of the isopropyl group on the cyclic double bond nearest to it results in a marked change in molecular refraction.
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