Studies on the synthesis of 1-aryloxy (alpha-substituted) acetyl-3-(substituted)phenyl-2-diethylamino-2-sulfide(selenide)-1,3,2-diazaphospholidine-4-one and Their herbicidal Activities

In order to look for a new herbicide, a series of novel phosphorus heterocy clic compounds have been prepared by the reaction of P(NEt2)(3) with compou nds containing 1,2-diamino groups at a high temperature. The structures of compounds II were characterized by H-1 NMR and elemental analysis, some of which were characterized by P-31 NMR and MS, The compound II I was analyzed by X-ray diffraction, The coplanar heterocycle and d(pi)-p(pi) electronic phenomenon of P-N bond were found. The preliminary biological tests indicat ed that some of them showed a better selective herbicidal activity.