Regioselective cycloaddition of dialkylsilylene upon irradiation at 440 nm converts azulene and guaiazulene to bicyclic [4]dendralene and heptafulvene derivatives, respectively. Significant σ–π interactions in the resulting new silacycles were suggested using UV-vis spectra and theoretical calculations.
![Graphical abstract: Transformation of azulenes to bicyclic [4]dendralene and heptafulvene derivatives via photochemical cycloaddition of dialkylsilylene](/en/Image/Get?imageInfo.ImageType=GA&imageInfo.ImageIdentifier.ManuscriptID=C5CC03424H&imageInfo.ImageIdentifier.Year=2015)
T. Kosai, S. Ishida and T. Iwamoto, Chem. Commun., 2015, 51, 10707 DOI: 10.1039/C5CC03424H
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