α/β-Naphthol is an important raw material for drug synthesis. Due to its special structure, α/β-naphthol and its analogs possess significant biological activity. The preparation and anti-oomyceteactivity of novelsulfonatederivatives based on α/β-naphthol againstPhytophthoracapsici have not been reported yet. METHODS Thirty-two sulfonatederivatives of α/β-naphthol (4a-p and 5a-p) were prepared. The