“…Oxygenation of sulfides through visible-light strategies have attracted wide research interestf rom organic and inorganic chemists since the last century.As eries of organic sensitizers including N-methylquinolinium tetrafluoroborate, [36] 9,10-dicyanoanthracene, [37] rose bengal, [38] 2,4,6-triphenylpyrylium tetrafluoroborate, [39] 4,4-difluoro-4-bora-3a,4a-diaza-s-indancene (BODIPY) [40] andmethyl blue [41] have been investigated. However,m ost of them produced am ixture of sulfoxides ands ulfones, and aldehydes were also detected as by-products in some cases.I n2 013, Yaoa nd co-workers reported as imple metal-free catalytic oxygenation of sulfides under visiblel ight and air,w ith high chemoselectivity.D uring reaction optimizations, they found the solvent was crucial for the selectivity;f or example, ethanol and methanols howed ag reat difference in selectivity.I na ddition, hydrogen chloride played ap romoter role for the efficiency (Scheme 19).…”