Abstract
A series of 4-substituted 2′-hydroxychalcones underwent photocyclization to give the corresponding flavanones selectively, but in low quantum yields, on visible irradiation in polar aprotic solvents. Hydroxylic solvents, which disturbed the formation of a cyclic intramolecular hydrogen bond, strongly retarded the photoreaction, while neither triplet quenchers nor free radical inhibitors affected the reaction. The quantum yields were independent of the light intensity, implying a one-photon process, but strongly depended on the wavelength of irradiation. Mechanisms were proposed assuming π, π* excited states and Weller's postulate of a dynamic equilibrium in a proton-transfer double-minimum potential.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
