Abstract
The ozonolysis of the bicyclo[2.2.1]heptene derivative 1 or 2 gave the octaline derivative 6 (the structure was confirmed by X-ray crystallographic analysis) or 7. The exo-addition of ozone to the double bond of 1 or 2 was followed by the fragmentation in carbonyl oxide and aldehyde. Then, the strong electrophilic character of the carbonyl oxide induces an unexpected Wagner–Meerwein rearrangement to give zwitterion 4. Finally, a fragmentation reaction with elimination of dioxygen gave the tetrasubstituted C–C double bonds of 6 or 7.
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