Solvent Action on Optical Rotatory Power IV. The Rotivity of Dipropionyl-Diethyl- d -Tartrate and l -Menthyl Acetate in Aromatic and Aliphatic Solvents

Experimental data are presented to demonstrate the validity of the equations of Beckmann and Cohen and Beckmann and Marks for the change of rotivity with solvent. Mixtures of polar and nonpolar solvents of both aromatic and aliphatic types were used with dipropionyl-diethyl-d-tartrate and l-menthyl acetate as optically active substances. The data are discussed in terms of the theory and essential agreement is found in all cases over a wide range of concentrations.