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Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions
Published on: July 17, 2020
Oxidation-State-Dependent Photochemistry of Sulfur-Bridged Aza-Anthracenes
Ryoga Hojo1, Hikaru Noguchi1, Jessica Toigo1
1Department of Chemistry, The University of British Columbia, 2036 Main Mall, Vancouver, British Columbia V6T 1Z1, Canada.
Abstract:
Aromatic systems with bridged sulfur units in varying oxidation states have enabled photoresponsive materials for anticounterfeiting and supramolecular assembly. However, only a few sulfoxide-bridged chromophores exhibit photoinduced sulfur extrusion, leading to drastic photophysical changes that make them useful as stimuli-responsive materials. Here, we present nitrogen-substituted anthracene (aza-anthracene) with a sulfur bridge in different oxidation states. Overall, aza-anthracene produces red-shifted green-to-red chromophores with similar sulfoxide photoconversion behavior compared to the anthracene analog.
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