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The pyrolytic rearrangement of exo-bicyclo [3.2.0] hepb6-ene oxide (1) and ero-bicyclo[4.2.0]oct-7-ene oxide (6) have been investigated. At 400°, the latter gives A2-cyclohexenylacetaldehyde (7), 1-methylcyclohexene, and 3 4-tetramethylene-2,s dihydrofuran (8). The corresponding cyclobutanones (10 and 11) were shown not to b& intermediates. The structures of the products have been assigned on the basis of comparison with authentic samples and further chemical transformations.At 420°, the former gives Az-cyclopentenylacetaldehyde (2) in 50y0 yield.

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