Abstract
Dithieno-annulated benzo[g]coumarins were synthesized in excellent yields using a facile photochemical oxidative cyclization method. These π-expanded benzocoumarins displayed strong absorption in the near-UV/visible region. Moreover, they revealed visible blue to yellow emission in solution when compared to simple benzo[g]coumarins or thienoannulated coumarins. This suggests their possible use in bio-imaging.
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