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I2-catalyzed C(sp2)–H bond sulfenylation have been achieved
from the reaction of thiols or disulfides with dihydropyrans
under metal-free conditions. This catalytic system was also
used for thiol-free achievement of sulfenylated dihydropyrans
from aryl halides in the presence of CuI and potassium
isopropyl xanthate as an effective source of sulfur.
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