2.

Photolysis of some 2-butenyl/butynylbischromones: Effect of solvent polarity

Rupesh Kumar and Mohamad Yusuf

Org. Commun. (2009), 2:1 ; 7-19

Department of Chemistry, Punjabi University, Patiala-147002, India

Abstract: Photochemistry of some 2-butenyl/butynyl-bischromones has been investigated in benzene and isopropanol-THF (1:1). The photoreactions are initiated through the intramolecular H-abstraction that leads to the formation of tetracyclic derivatives and vinyl bischromones. Photolytic conversion of the bischromones is found to be dependent upon the nature of the intermediate spacer and H-donating capability of the solvent.

Keywords: 1,4-biradicals; bischromones; chromophores; photolytic conversion; intermediate spacer.