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Compositions for safening rice against acetochlor

A herbicidal composition, a technology of acetochlor, applied in the directions of animal repellents, plant growth regulators, botanical equipment and methods, etc., can solve the problems of rice damage, phytotoxicity of rice, poor effect and the like

Inactive Publication Date: 2000-04-05
ZENECA LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the rice suffers from phytotoxicity due to the absence of safeners, so the use is ineffective
[0020] Although the use of acetochlor on other crops is well known, it should be taken into account that acetochlor is severely damaging to rice at the concentrations necessary for effective weed control

Method used

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  • Compositions for safening rice against acetochlor
  • Compositions for safening rice against acetochlor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment I

[0049] Methyl benzylmethoxyacetate (Compound 3, Table I).

[0050] Add 0.7g of sodium hydride (0.023mol, 80% oil dispersion), 5mL of tetrahydrofuran and 3.7g of diphenylmethanol (0.02mol, dissolved in 20mL of tetrahydrofuran) to a 200mL round bottom flask, and the reaction mixture Reflux for 5 minutes. Then, 2.1 mL of methyl bromoacetate (0.022 mol) was added, and a precipitate formed. The solvent was removed, the resulting solid was dissolved in dichloromethane, and water was added. The organic layer was separated, followed by drying over magnesium sulfate. The resulting oil was chromatographed on a silica gel column with hexane and ethyl acetate. The obtained product was confirmed by NMR, IR and mass spectrometry.

[0051] The compounds in Table I are effective safeners of acetochlor on rice crops. The synthesis of compounds 2 and 3 is described in US Patent No. 4,964,893.

[0052] Compound No.

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PUM

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Abstract

This invention is directed to an herbicidal composition comprising, a) an herbicidally effective amount of acetochlor; and b) a non-phytotoxic antidotally effective amount of a compound according to formula (I), wherein each of R1 and R2 independently represents one or more substituents selected from hydrogen, (C1-C6)alkyl, (C1-C6)alkoxy, (C1-C6)alkylamino, halo, halo(C1-C6)alkyl, (C1-C6)alkoxy-(C1-C6)alkyl and nitro; wherein A is selected from wherein each of R3 and R4 is independently selected from hydrogen, (C1-C6)alkyl, halo(C1-C6)alkyl, cyano(C1-C6)alkyl, (C1-C6)alkoxy-(C1-C6)alkyl, (C2-C6)alkenyl, (C2-C6)alkynyl, phenyl, nitrophenyl, benzyl, halobenzyl, pyridinyl(C1-C6)alkyl and (C1-C6)alkylammonium; and n is 0 or 1.

Description

field of invention [0001] The present invention relates to safeners, herbicide compositions and methods of use thereof, more particularly, the present invention relates to safened acetochlor compositions and their use on rice. Background of the invention [0002] The need for highly effective herbicides needs no special emphasis. The control of weeds and unwanted plants is of great economic importance since competition from weeds inhibits leaf, fruit or seed and crop yields. The presence of weeds reduces harvesting efficiency and the quality of the harvested crop. Therefore, it is very beneficial to inhibit the growth of unwanted weeds. [0003] Herbicides are commonly used to control or eradicate weeds in a variety of crops. The present invention places particular emphasis on the suppression of unwanted weeds in paddy fields. The use of herbicides increases rice yields and reduces harvesting costs. [0004] At the levels of herbicides necessary to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01N25/32A01N37/26
CPCA01N37/26A01N25/32A01N2300/00
Inventor D·R·贝克R·L·法兰茨K·科达雅里
Owner ZENECA LTD