Triketone derivatives

Details Triketone derivatives Triketone derivatives

1997-12-19

1999-10-12

Kight, John

Plant protecting and regulating compositions

Plant growth regulating compositions

Organic active compound containing

549 23, A01N 4316

Patent

active

059654929

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

The present invention relates to a triketone derivative and a herbicide containing the same.


BACKGROUND ART

Herbicides are very important chemicals for labor-saving of weed control and improving the productivity of agricultural and horticultural crops. Herbicides have been therefore actively studied and developed for many years, and a variety of herbicides are practically used. However, it is still desired today to develop novel chemicals having further prominent herbicidal properties, particularly chemicals which can selectively control target weeds alone without causing phytotoxicity on cultivated crops and which can also control them at a low dosage.
During a 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. However, atrazine shows low efficacy to gramineous weeds, and on the other hand, alachlor and metolachlor show low efficacy to broad-leaved weeds. It is therefore difficult at present to control gramineous weeds and broad-leaved weeds together simultaneously with a single herbicide. Further, the above herbicides are undesirable in view of an environmental problem due to their high dosage requirement.
In view of the above circumstances, the present inventors have invented novel triketone derivatives having a thiochroman ring and filed a patent application therefor (International Patent Application WO94/04524). A typical example disclosed in this Publication is as follows. ##STR2##
However, the above compound is not fully satisfactory in soil treatment activity although it is free of phytotoxicity on corn and has high foliar treatment activity.


DISCLOSURE OF INVENTION

It is an object of the present invention to provide a triketone derivative which can control a broad range of upland weeds at a low dosage without causing phytotoxicity on crops such as corn, etc.
The present inventors have made diligent studies to achieve the above object, and as a result, have found that a novel triketone derivative of the following general formula (I) can control a broad range of upland weeds at a low dosage without causing phytotoxicity on crops such as corn, etc. The present invention has been accordingly completed.
The present invention is directed to ##STR3## wherein: Y.sup.1 is a C.sub.1 .about.C.sub.4 alkyl group, a halogen atom or a C.sub.1 .about.C.sub.4 haloalkyl group, group, halogen atom, atom, a C.sub.1 .about..sub.4 alkyl group or a phenyl group, or when p is 1, either R.sup.1 or R.sup.2 and either R.sup.3 or R.sup.4 may bond to each other to form an intramolecular double bond, and ##STR4## (in which each of R.sup.5 and R.sup.6 is independently a hydrogen atom, a C.sub.1 .about.C.sub.4 alkyl group or a phenyl group), and formula (I) as an active ingredient.


PREFERRED EMBODIMENTS FOR PRACTICING INVENTION

First, the triketone derivative of the present invention will be explained.
The triketone derivative of the present invention has the general formula (I). ##STR5##
In the above general formula (I), Y.sup.1 is a C.sub.1 .about.C.sub.4 alkyl group, a halogen atom or a C.sub.1 .about.C.sub.4 haloalkyl group. The C.sub.1 .about.C.sub.4 alkyl group includes methyl, ethyl, propyl groups such as n-propyl and i-propyl, and butyl groups such as n-butyl and i-butyl. Methyl is preferred. The halogen atom includes fluorine, chlorine, bromine and iodine atoms. The C.sub.1 .about.C.sub.4 haloalkyl group includes --CH.sub.2 Cl, --CHCl.sub.2, --CCl.sub.3, --CCl.sub.2 CH.sub.3, --CH.sub.2 F, --CHF.sub.2, --CF.sub.3, --CF.sub.2 CH.sub.3, --CH.sub.2 CH.sub.2 F, --CF.sub.2 CF.sub.3, --CH.sub.2 CH.sub.2 CHF.sub.2, --CH.sub.2 CH.sub.2 CH.sub.2 CH.sub.2 F, CH.sub.2 CH.sub.2 CHCl.sub.2, --CH.sub.2 CH.sub.2 CH.sub.2 CH.sub.2 Cl, --CH(CH.sub.3) CH.sub.2 F, --CH(C.sub.2 H.sub.5)CH.sub.2 F, and --CH (CH.sub.3)CH.sub.2 Cl. Y.sup.1 is preferably methyl, a chlorine atom or --CF.sub.3, particularly preferably methyl.
Each of Y.sup.2 and Y.sup.3 is independently a C.sub.1 .about.C.sub.4 alkyl gr

REFERENCES:
patent: 5468878 (1995-11-01), Nasuno et al.
patent: 5480858 (1996-01-01), Sakamoto et al.

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