The intramolecular nucleophilic addition of 2-allylphenol was catalyzed by RuCl3·nH2O/AgOTf–PPh3–Cu(OTf)2 to afford 2,3-dihydro-2-methylbenzofuran in good yield, while 2-(3-butenyl)phenol was converted to 3,4-dihydro-2(2H)-methylbenzopyran.
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Hori et al. (1998) studied this question.
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