Principles of the HOSE model

The HOSE model has already been reviewed [46,47], but on the basis of its original presentation, without practical hints for further applications. We make an attempt to present the HOSE model in a way which approaches closer the way of thinking used in everyday practice of organic chemistry. Moreover, we wish to present it in such a way that will give a better insight into how the model may be applied to some new problems. Within the frame work of the HOSE model, the following assumptions are made  

Geometry of the molecule or its fragment is realized as a result of optimization of all intramolecular interactions (forces) present in it as well as all intermolecular interactions in which this molecule or its fragment is involved. In most cases the intermolecular interactions may be neglected. 

Geometry of a given, i-th, canonical structure assumes that some bonds are purely single, some others are purely double. Hence some values of single X-Y bonds and double X=Y bonds are used in the model as references. 

The real geometry of the molecule or its fragment is a weighting sum of a few (in principle many) canonical structures. Thus their proper blend allows us to obtain the real geometry. 

Deformations of bond lengths in the real molecular geometry from some reference lengths (cf point 2 above) may be approximately described in terms of the harmonic potential. 

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