Abstract
Solid-state UV irradiation of crystalline 4-acetoxy-6-styryl-α-pyrone 1b yeilds [2π+2π] dimers of different constitutions (2b,26% ; 3b, 30%) at 69% conversion of 1b. This dichotomy is a consequence of the crystal topology of 1b, which contains two topochemically relevant reaction centers, each composed of two monomers arranged at a center of inversion. In contrast, the isomorphously crystallized isoelectronic 4-acetoxy-6-styryl-1,5-oxazinone 4 is photostable. The electronic properties of 1b and 4 in the ground and excited states correlate with this difference in photoreactivity. Pyrone 1b exhibits monomer and excimer fluorescence emission in dilute solution and in the crystal, respectively, whereas the oxazinone 4 under both conditions shows solely monomer fluorescence
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.
