Masahiko Yamaguchi, Mieko Arisawa, Yoshiyuki Kido and Masahiro Hirama
Phenols are 2,6-divinylated by treatment with ethyne at 100 °C in chlorobenzene in the presence of SnCl4–Bu3N, 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.