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The photochemistry (λ 254 nm) of exo-(1) was examined. In nonhydroxylic solvents an αβ-unsaturated lactone (2) was formed. In hydroxylic solvents a βγ-unsaturated ester (3) was also formed, which is proposed to arise from a keten intermediate. Upon acetone-sensitized irradiation of exo-(1) only exo–endo isomerization occurs.
P. C. M. van Noort and H. Cerfontain, J. Chem. Soc., Perkin Trans. 2, 1978, 757 DOI: 10.1039/P29780000757
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