A Simple Purification Procedure for DDT¹

Abstract

II (2 g.) was dissolved in acetic acid (50 cc.) and, after addition of potassium dichromate (2 g.) in acetic acid (30 cc.), heated to boiling for two minutes. Upon pouring onto ice, a yellow precipitate (1.7 g.) was obtained. It crystallized from ethanol in yellow prisms of m. p. 135-136°. An additional recrystallization from acetic acid raised the m. p. to 140-141 °, as reported in the literature.6 The yield of pure produpt was 1.2 g. (60%).

Associated decomposition of DDT to DDE in the diffusion of DDT on homoionic clays

“…The p.p'-DDT isomer used (mp, 110.0°-110.5°C ) was obtained from a commercial insecticide by means of successive recrystallizations in ethanol (Cook and Cook, 1946). The DDE was obtained by dehydrohalogenation of DDT with KOH in an ethanol solution (Melgarejo, 1964).…”