Conformational restriction theoretical points

According to the developed approach, the main contribution to the change of the structure of the layer is made by the conformational restrictions. Such a conclusion has already been reached earher on the basis of experimental data and is of interest as one of the first attempts to describe the effect from the theoretical point of view. 

The restriction of the theoretical treatment of optical rotations of cyclopropanes I to the basis of equations 2, 3 and 5 has several implications with regard to the descriptions of molecules on the conformational level. A discussion of some special cases shall demonstrate that the success of equation 2 does not mean that for the theoretical treatment of optical rotations only the configurational level for representing molecules is relevant. On the contrary, an adequate description of optical rotations of organic compounds must take the various conformations of the compounds and the conformer equilibria explicitly into account The very point is that, due to favorable conformational equilibria, often rotation contributions from conformational effects are small or cancel (to a large extent). 

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