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The rhodium-catalyzed ortho-alkenylation of phenyl sulfoxides using alkenes or alkynes as substituent sources proceeds efficiently through sulfoxide group directed C-H bond cleavage to produce the corresponding o-alkenylphenyl sulfoxides. The products readily undergo interrupted Pumerer cyclization as well as reduction to afford benzothiophenes and o-alkenylphenyl sulfides.
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Nobushige et al. (2014) studied this question.
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