Synthesis and pesticidal activity of phenazines II.—Alkyl, alkoxy, alkylthio and alkylsulphonyl phenazines

Abstract

Abstract The synthesis of forty‐one phenazines, mono‐substituted with alkyl, alkoxy, alkylthio and alkylsulphonyl groups is described. Phytotoxicity was highest in the alkyl series and both 1‐ and 2‐methylphenazines are highly effective. herbicides. Although several n‐alkyl, branched alkyl and n‐alkoxyphenazines were highly fungicidal and acaricidal, only 2‐t‐octylphenazine combined high dual activity with negligible phytotoxicity.