SCHEDULED MAINTENANCE
The free energy of activation for the [3,3] sigmatropic rearrangement of the spirodienones (3)→(4) is significantly increased by restraints which impose twisting distortions on the boat-like transition state.
C. J. Dixie and I. O. Sutherland, J. Chem. Soc., Chem. Commun., 1972, 646 DOI: 10.1039/C39720000646
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