Alkyl- and aryl vinyl sulfones were obtained by eosin Y (EY)-mediated visible-light photooxidation of sulfinate salts and the reaction of the resulting S-centered radicals with alkenes. Optimized reaction conditions, the sulfinate and alkene scope, and X-ray structural analyses of several reaction products are provided. A detailed spectroscopic study explains the reaction mechanism, which proceeds through the EY radical cation as key intermediate oxidizing the sulfinate salts.

Department of Chemistry and RECETOX Masaryk University Kamenice 5 625 00 Brno Czech Republic

University of Regensburg Faculty of Chemistry and Pharmacy Institute of Organic Chemistry Universitätsstrasse 31 93053 Regensburg Germany

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