Abstract
The rates of ring inversion in 4-methyl-1,3,2-dioxathian-2,2-dione have been measured in p-xylene solution by the ultrasonic relaxation technique. From the temperature-dependence of these inversion rates the barrier to ring inversion was found to be 4·6 kcal./mole and the entropy of activation was –6·3 cal./mole/deg. In the equilibrium between the axial and equatorial chair isomers 95% of the molecules are in the chair form with the methyl group equatorial at 30°.
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More From: Journal of the Chemical Society A: Inorganic, Physical, Theoretical
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