Benzoylpyrazoles and herbicide

1. Benzoylpyrazoles represented by the formula (I):

wherein

R 1 represents alkyl;

R 2 represents alkyl or cycloalkyl;

R 3 represents hydrogen, alkyl, alkenyl, alkynyl, aralkyl, alkylsulfonyl, optionally substituted phenylsulfonyl, acyl or acylalkyl;

X represents halogen or alkyl;

Y represents halogen;

n represents 2 or 3, and

T represents a group T1:

or a group T2:

wherein R 4 represents hydrogen, alkyl, alkoxy or alkylthio.

2. The compound according to claim 1 , wherein

R 1 represents C 1-6 alkyl;

R 2 represents C 1-6 alkyl or C 3-7 -cycloalkyl;

R 3 represents hydrogen, C 1-6 alkyl, C 3-7 alkenyl, C 3-7 alkynyl, C 7-12 aralkyl, C 1-6 alkylsulfonyl, optionally C 1-6 alkyl-substituted phenylsulfonyl, C 1-6 alkylcarbonyl, benzoyl or benzoyl-C 1-6 alkyl;

X represents halogen or C 1-6 alkyl;

Y represents halogen;

n represents 2 or 3; and

T represents a group T1:

or a group T2:

wherein R 4 represents hydrogen, C 1-6 alkyl, C 1-6 alkoxy or C 1-6 alkylthio.

3. The compound according to claim 1 , wherein

R 1 represents methyl or ethyl;

R 2 represents methyl, ethyl or cyclopropyl;

R 3 represents hydrogen, methyl, allyl, propargyl, benzyl, methanesulfonyl, n-propanesulfonyl, optionally methyl-substituted phenylsulfonyl, acyl, benzoyl or phenacyl;

X represents chlorine, bromine or methyl;

Y represents chlorine or bromine;

n represents 2 or 3; and

T represents a group T1:

or a group T2:

wherein R 4 represents hydrogen, methyl, ethyl, methoxy or methylthio.

4. A herbicide comprising, as an effective ingredient, the compound according to claim 1 .

5. The compound represented by the formula (II):

Wherein

X represents halogen or alkyl;

Y represents halogen;

n represents 2 or 3, and

T represents a group T1:

or a group T2:

wherein R 4 represents hydrogen, alkyl, alkoxy or alkylthio, and Z represents a group:

Wherein R 1 represents alkyl;

R 2 represents alkyl or cycloalkyl.

6. A herbicide comprising, as an effective ingredient, the compound according to claim 2 .

7. A herbicide comprising, as an effective ingredient, the compound according to claim 3 .

8. A method for preparing a compound of claim 1 , comprising using a compound of formula II

wherein

X represents halogen or alkyl;

Y represents halogen;

n represents 2 or 3, and

T represents a group T1:

or a group T2:

wherein R 4 represents hydrogen, alkyl, alkoxy or alkylthio and Z represents a group:

wherein

R 1 represents alkyl;

R 2 represents alkyl or cycloalkyl, as an intermediate in said method.