Phenols are 2,6-divinylated by treatment with ethyne at 100 °C in chlorobenzene in the presence of SnCl 4 –Bu 3 N, the divinylation occurring predominantly to exclusively with phenol, alkylphenols and alkoxyphenols; an appropriate amount of the tin reagent and the correct reaction temperature are essential for the divinylation.
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Yamaguchi et al. (1997) studied this question.
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