title: Photo retro-Diels-Alder reactions.
abstract: Photo-retro-Diels-Alder (PrDA) reactions of a variety of Diels-Alder (DA) adducts were studied. Experimental results showed that the photoreactivity (quantum yield) depends on the electron-donating ability of the diene component and the electron-withdrawing ability of the dienophile component. The mechanism was studied by trapping the reaction intermediate, O(2) quenching, time-resolved absorption, and fluorescence spectroscopy. All the results support a mechanism that involves a charge-separated intermediate generated from a singlet excited state. The PrDA reaction may find applications in photoresponsive materials, photolithography, drug delivery, and mechanistic research.
authors.affiliation: Department of Chemistry, University of Central Florida, Orlando, Florida 32816, USA.
authors.forename: Valentine K
authors.initials: VK
authors.lastname: Johns
authors.forename: Zheng
authors.initials: Z
authors.lastname: Shi
authors.forename: Wei
authors.initials: W
authors.lastname: Dang
authors.forename: Matthew D
authors.initials: MD
authors.lastname: McInnis
authors.forename: Yuxiang
authors.initials: Y
authors.lastname: Weng
authors.forename: Yi
authors.initials: Y
authors.lastname: Liao