Herbicidally active 2-substituted 5-penoxyphenylphosphonic acid

Details Herbicidally active 2-substituted 5-penoxyphenylphosphonic acid Herbicidally active 2-substituted 5-penoxyphenylphosphonic acid

1981-12-28

1983-12-20

Sutto, Anton H.

Chemistry: fertilizers

Processes and products

Forms or conditioning

71 87, 71 76, 260940, 260951, A01N 5714

Patent

active

044215487

ABSTRACT:
The present invention relates to novel herbicidal and plant growth-inhibiting 2-substituted 5-phenoxyphenylphosphonic acid derivatives of the formula ##STR1## wherein each of R.sub.1 and R.sub.2 independently is hydroxyl, lower alkoxy, lower alkylthio, alkylamino, dialkylamino, chlorine, benzyloxy or benzylthio, X is halogen or a --CF.sub.3, --NO.sub.2, --CN, --CONH.sub.2 or --CSNH.sub.2 group, n is 0 to 3, and Y is --OH, halogen, NO.sub.2, --CN, NH.sub.2, --NHCO--R, --NHCOOR or --NH--SO.sub.2 --R, wherein R is an unsubstituted or halogenated lower alkyl radical. Preferred compounds are 2-nitro-5-(2'-chloro-4'-trifluoromethylphenoxy)-phenylphosphonic acid and the lower dialkyl esters thereof. The invention also relates to the production of the novel phosphonic acid derivatives, starting from a 3,4-dinitrodiphenyl ether and reacting it with a trialkylphosphite as first step. The invention further relates to herbicidal and plant growth-regulating compositions which contain one of the 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 soil, as well as for totally destroying existing plant growth.

REFERENCES:
Abstract of Japanese Koki Tokkyo Koho JP 82, 14,595, "Chem. Abstracts", vol. 97, (1982), 24007m.

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