@article{oai:kutarr.kochi-tech.ac.jp:00000232,
 author = {Asahara, Haruyasu and Mochizuki, Eiko and Oshima, Takumi},
 issue = {25},
 journal = {Tetrahedron Letters},
 month = {},
 note = {Irradiation of diphenylbicyclo[4.2.0]oct-3-ene-2,5-diones bearing variously substituted Me groups resulted in the reversible intramolecular [2+2] cycloaddition between the excited enedione C=C double bond and the facing endo-phenyl ring to exclusively give pentacyclotetradeca-10,12-diene-2,7-diones. The equilibrated product ratios were much dependent on the substitution pattern of the Megroups as well as the irradiated wavelength. The regiochemistry of these photoadditions was elucidated on the basis of the restricted conformation of the starting enediones.},
 pages = {7881--7884},
 title = {Conformational Analysis in Reversible Intramolecular [2+2] Photocycloaddition of Diphenylbicyclo[4.2.0]oct-3-ene-2,5-diones},
 volume = {47},
 year = {2006}
}