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Ab initio molecular orbital theory has been used to study in detail the C2H20 potential energy surface. Equilibrium structures and transition structures have been explicitly identified by using gradient techniques and the split-valence 4-31G basis set. Improved relative energies have been obtained by using the split-valence

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2‐Hydroxymethyl‐2‐cyclopentenone intermediate: 2‐Bromo‐2‐cyclopentenone. intermediate: 2‐Bromo‐2‐cyclopentenone ethylene ketal intermediate: 2‐hydroxymethyl‐2‐cyclopentenone ethylene ketal product: 2‐hydroxymethyl‐2‐cyclopentenone