Resumen

KAMBOJ, Ramesh C. et al. Photochemistry of 3-alkoxychromones: photocyclisation of 2-aryl-6-chloro-3-{(thiophen-2-yl)methoxy}chromones. J. Braz. Chem. Soc. [online]. 2010, vol.21, n.2, pp. 270-278. ISSN 0103-5053.  http://dx.doi.org/10.1590/S0103-50532010000200012.

1,4-Biradicals generated upon photo-irradiation of 2-aryl-3-{(thiophen-2-yl)methoxy}chromones produced angular tetracyclic products bearing the thienyl group. The dehydrogenation and ring contraction products were also observed depending upon the electron density on the 2-aryl ring.

Palabras llave : alkoxychromone; type-II reaction; 1,4-biradical; ring contraction; angular tetracyclic.