Using a new semirigid model, conformation maps of cyclohexane,phyphen;dioxane,mhyphen;dioxane, and cycloheptane are recalculated. The ideal outhyphen;ofhyphen;plane coordinates are used together with inhyphen;plane coordinates and are found to give the correct energies of all the significant conformations of six membered rings and of the chairndash;twistndash;chair form of cycloheptane. Conformation maps display higher symmetry than maps previously reported.
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