Figure 3. Interconversion of cyclopropyl cation and allyl cation.As to the photochemical transformations, the first excited state of either radical should also isomerize by the conrotatory mode, but in the second excited state, which lies very close above the first, disrotatory transformations are to be expected.We have thought it worthwhile to supplement the discussion of Woodward and Hoffman in this way because orbital and state correlation diagrams enable one to follow a reaction along its entire course and draw qualitative conclusions without necessarily engaging in numerical computations.(2) E. W. A., at present on leave from the Case Institute, Cleveland, Ohio, wishes to thank the National Institute of Neurological Diseases and Blindness for a Fellowship.
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