Abstract
Strain energies are calculated for a series of polycyclic alkanes containing small-membered rings by the MINDO molecular orbital theory. Comparison of experimental and theoretical strain energies indicates that while the MINDO method accounts for the total strain semiquantitatively, it fails to predict correctly the nonadditivity of strain in bicyclic and spirocyclic systems. Significant strain energies are also predicted for cyclopropane and cyclobutane by the Extended Huckel Method, although these effects are swamped by errors introduced in the handling of nonbonded interactions by the method.
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