Abstract 4a-(Z-1-Propenyl)-bicyclo [4.4. 0] dec-1 (8a)-en-2-one (6) and 4a-(Z-1-propenyl)- bicyclo [4.4. 0] deca-1 (8a), 7-dien-2-one (17) undergo an intramolecular hydrogen transfer from the methyl group of the propenyl substitutent to the α-carbon atom of the enone group, and cyclization to the [4.4. 3] propellane derivatives 9 and 30, respectively, when excited in the π [RIGHTWARDS ARROW] π* wavelength region. The quantum yield for (Z)-6 [ ...
