Cycloolefin conformations

All the subsequently shown compounds possess a chirality plane and their helicities can again be described with respect to interposed 4-point figures. In this class belong in the first place so-called ansa-compounds, unsym-metrically substituted cyclophanes, and certain cycloolefin conformations. 

Macrocyclization equilibrium data from metathesis reactions of cycloolefins are compared with predictions of a novel, simple RIS scheme for polyalkenes with at least three single bonds between adjacent double bonds. The predictions agree with experiment within the combined experimental errors, supporting the conformational models and confirming that macrocyclization equilibrium has indeed been established in the metathesis reactions. 

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