Phenols were vinylated at the ortho-position with ethyne in the presence of SnCl(4)-Bu(3)N reagent. The reaction was applicable to phenols possessing either electron-donating or electron-withdrawing groups. 2,6-Divinylphenols were synthesized under modified conditions. A reaction mechanism involving carbostannylation of alkynyltin and phenoxytin was discussed.
Catalytic Ethenylation Reaction of Phenol Using SnCl<sub>4</sub>
作者:Katsumi Kobayashi、Masahiko Yamaguchi
DOI:10.1021/ol006888d
日期:2001.1.1
[figure: see text] Ethenylation reaction of phenol with silylethyne at the o-position is catalyzed by the SnCl4-BuLi reagent. While turn over numbers (TONs) in the reactions of m- or p-substitutedphenols are 3 to 4, those for o-substituted phenols are 8 to 9.