The equilibrium between the rigid and the flexible isomer of cyclohexane is calculated. The results indicate that a t ordinary temperatures the flexible isomer occurs a t most to a very slight extent. At higher temperatures it may occur in concentrations which are large enough t o allow an experimental confirmation.Cyclohexane resembles in many respects the saturated paraffinic hydrocarbons. This has led to the hypothesis that the valence state of the carbon atom in cyclohexane is similar to the valence state in saturated molecules where, according to Van't Hoff and Le Bel, one has to assume a tetrahedral arrangement of the four valencies. On the basis of this hypothesis, Sachse derived by geometrical considerations that two isomers of the cyclohexane molecule might be possible. The angles between two consecutive carbon-carbon bonds being less than IzoO-in our case 1 0 g O 28' 16"--it is possible to construct an infinite number of configurations which can be divided into two groups. In one group the six-membered ring can pass continuously through an infinite number of configurations.
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