Pyrazole derivatives

Details Pyrazole derivatives Pyrazole derivatives

1998-01-06

1999-01-26

Clardy, S. Mark

Plant protecting and regulating compositions

Plant growth regulating compositions

Organic active compound containing

5483644, C07D40910, A01N 4356

Patent

active

058638660

DESCRIPTION:

BRIEF SUMMARY
This application has been filed under 35 USC 371 as national stage application of PCT/JP 96/00810.


TECHNICAL FIELD

The present invention relates to pyrazole derivatives and herbicides containing the pyrazole derivatives as active ingredients.


TECHNICAL BACKGROUND

It is indispensable to use a herbicide for protecting, and increasing the yields of, useful crops such as rice, wheat, barley, corn, soybean, cotton, beet and the like. In recent years in particular, there are desired selective herbicides which cause no phytotoxicity on the useful crops but selectively control weeds alone by foliar treatment of the crops and the weeds at the same time in a cultivated field where the useful crops and weeds are concurrently present.
During the planting time of corn, etc., triazine-based herbicides such as atrazine and acid anilide-based herbicides such as alachlor and metolachlor have been conventionally used as soil treating chemical. However, these herbicides require high dosage and are therefore causing environmental problems such as pollution of ground water.
In recent years, further, "non-tilled cropping" intended for soil conservation is promoted. "Non-tilled cropping" is a method of cultivating crops without plowing, and is against usual tilled cropping. In tilled cropping, fertile surface soil which is tilled (plowed) is washed away by rain, etc., which is not only a great farming problem but also a problem which leads to a kind of desertification. On the other hand, in non-tilled cropping, there is no problem of surface soil being washed away. However, without tilling, soil is hardened so that a chemical is scarcely infiltrated into the soil, and the effect of the chemical on soil treatment decreases. In the non-tilled cropping, therefore, there are demanded herbicides which have high herbicidal efficacy at a low dosage in soil treatment and which can be used as a single chemical for foliar treatment as well.
International Laid-open Patent Publication No. WO93/18031 discloses herbicidally active pyrazole derivatives having a thiochroman ring, represented by the following formula, ##STR1##
wherein R.sup.1 is a C.sub.1 -C.sub.6 alkyl group. Explanations of the other symbols are omitted.
Typical compound (A) of the above International Laid-open Patent Publication (Compound No. 66 in the Publication) has the following structural formula. ##STR2##
The above compound (A) shows excellent selectively between crops and weeds without damaging cultivated crops when used for the treatment of corn, wheat, barley, etc., at the stage of 1.about.2 leaves. However, when the foliar treatment is carried out at the stage of 3.about.4 leaves, the safety to the crops is not fully satisfactory.


DISCLOSURE OF THE INVENTION

It is a first object of the present invention to provide a novel pyrazole derivative which has remarkably high herbicidal activity against a broad range of weeds at a low dosage, exhibits high safety to useful crops such as wheat, barley, corn, soybean, cotton, beet, rice, etc., and exhibits excellent selectivity between crops and weeds, in both foliar treatment and soil treatment.
Further, it is a second object of the present invention to provide a herbicide containing the above novel pyrazole derivative as an active ingredient.
The present inventors have made diligent studies for creating novel pyrazole derivatives which can achieve the above objects, and as a result have found the following. Compounds obtained by replacing the C.sub.1 -C.sub.6 alkyl group as R.sup.1 in the structural formula of the pyrazole derivative of the above International Laid-open Patent Publication by a C.sub.1 -C.sub.6 haloalkyl group having at least one halogen atom exhibits excellent selectivity between crops and weeds. The present invention has been completed on the basis of the above finding.
That is, the first object of the present invention is achieved by a pyrazole derivative of the formula (I), ##STR3##
wherein: halogen atom; atom or a C.sub.1 .about.C.sub.4 alkyl group;
in which which k is an integer of 0 or 1 to 3

REFERENCES:
patent: 5468722 (1995-11-01), Shibata et al.

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