Photorearrangement of 4,4,5,5-Tetramethoxycyclohepta-2,6-dienones to 6,6,7,7-Tetramethoxybicyclo[3.2.0]hept-3-en-2-ones
作者:Akira Mori、Tadahiko Kubota、Hitoshi Takeshita
DOI:10.1246/cl.1988.71
日期:1988.1.5
The photorearrangement of 2,6-cycloheptadienones to bicyclo[3.2.0]hept-3-en-2-ones was observed. The bicycloketones further photoisomerized to bicyclo[2.2.1]heptenones via a [1,3] sigmatropy.
polysubstituted 2,6-cycloheptadien-1-ones gave bicyclo[3.2.0]hept-3-en-2-ones, lumiketone-like products, which subsequently photoisomerized to bicyclo[2.2.1]hept-2-en-7-ones. The reaction of cycloheptadienones to lumiketones was proven to proceed via a triplet excited state from both sensitization and quenching experiments.