申请人:Ciba-Geigy Corporation
公开号:US04434108A1
公开(公告)日:1984-02-28
The invention relates to novel herbicidally active and plant-growth regulating 2-substituted 5-phenoxyphenylphosphinic acid derivatives of the formula ##STR1## wherein R.sub.1 is an unsubstituted or substituted alkyl or aryl radical, R.sub.2 is a hydroxyl group, lower alkoxy, alkylthio, alkylamino, dialkylamino or chlorine, X is halogen or is selected from the group consisting of --CF.sub.3, --NO.sub.2 or --CN, n is 0 to 3, and Y is selected from the group consisting of --NO.sub.2, --NH.sub.2, --OH, --CN, or is halogen. Preferred compounds are 2-nitro-5-(2'-chloro-4'-trifluoromethylphenoxy)phenylalkylphosphinic acids and lower alkyl esters thereof. The invention also relates to the production of the novel phosphinic acid derivatives, starting from a 3,4-dinitrodiphenyl ether and reaction with a O,O-dialkylalkyl- or -arylphosphonite as first step. The invention further relates to herbicidal and plant growth regulating compositions which contain one of these novel compounds as active component, and also to the use of these compounds and compositions for controlling weeds (also selectively), for inhibiting plant growth and desiccating parts of plants above the ground, as well as for totally destroying existing plant growth.
本发明涉及一种新型的除草活性和植物生长调节剂2-取代5-苯氧基苯基膦酸衍生物,其化学式为##STR1##其中R.sub.1是未取代或取代的烷基或芳基基团,R.sub.2是羟基、低级烷氧基、烷基硫基、烷基氨基、二烷基氨基或氯,X为卤素或选自--CF.sub.3、--NO.sub.2或--CN的基团,n为0至3,Y选自--NO.sub.2、--NH.sub.2、--OH、--CN或卤素。优选的化合物为2-硝基-5-(2'-氯-4'-三氟甲基苯氧基)苯基烷基膦酸及其较低烷基酯。本发明还涉及从3,4-二硝基二苯醚出发,与O,O-二烷基烷基或芳基膦酸酯反应作为第一步的新型膦酸衍生物的制备。本发明还涉及含有这些新化合物作为活性成分的除草和植物生长调节剂组合物,以及利用这些化合物和组合物控制杂草(也具有选择性)、抑制植物生长和使地上植物部分脱水,以及完全破坏现有的植物生长的用途。