Pyrazolone compound and pyrazolone agent

A pyrazolone compound represented by the following formula (1):

• wherein R1 is an electron withdrawing group selected from the group consisting of one or more selected from the group consisting of a halogen atom, a nitro group, a cyano group, a haloalkyl group having 1 to 10 carbon atoms (one or more halogen atoms attached to the carbon atom at position 1), a perfluoropolyether group having 2 to 10 carbon atoms, a carboxy group, a substituted aryl group having 6-60 carbon atoms (wherein a benzene ring attached to the side of pyrazolone skeleton has at least one substituent, and said substituent is one or more group selected from a halogen atom, a nitro group, a cyano group, a haloalkyl group having 1 to 10 carbon atoms (one or more halogen atoms are attached to the carbon atom at position 1), perfluoropolyether group having 2 to 10 carbon atoms, a carboxy group, an acyl group having 2 to 61 carbon atoms, an alkoxycarbonyl group having 1 to 60 carbon atoms, an alkoxy group having 1 to 60 carbon atoms, and alkyl group having 1 to 60 carbon atoms;
• and when the substituent is the alkoxy group having 1 to 60 carbon atoms or the alkyl group having 1 to 60 carbon atoms, the position of the substituent is the meta-position of the benzene ring attached to the side of the pyrazolone skeleton), and the following formulas (2) to (7):
• wherein
• R3 is a halogen atom, a nitro group, a cyano group, a haloalkyl group having 1 to 10 carbon atoms, a perfluoropolyether group having 2 to 10 carbon atoms, a carboxy group, an optionally substituted alkyl group having 1 to 60 carbon atoms, an optionally substituted alkenyl group having 1 to 60 carbon atoms, an optionally substituted alkynyl group having 1 to 60 carbon atoms, an optionally substituted aralkyl group having 1 to 60 carbon atoms, an optionally substituted aryl group having 6 to 60 carbon atoms, an optionally substituted alkoxy group having 1 to 60 carbon atoms, an optionally substituted alkenyloxy group having 1 to 60 carbon atoms, an optionally substituted alkynyloxy group having 1 to 60 carbon atoms, an optionally substituted aralkyloxy group having 1 to 60 carbon atoms, and/or an optionally substituted aryloxy group having 6 to 60 carbon atoms, and
• R4 is a halogen atom, a nitro group, a cyano group, a haloalkyl group having 1 to 10 carbon atoms, a perfluoropolyether group having 2 to 10 carbon atoms, a carboxy group, an optionally substituted alkyl group having 1 to 60 carbon atoms, an optionally substituted alkenyl group having 1 to 60 carbon atoms, an optionally substituted alkynyl group having 1 to 60 carbon atoms, an optionally substituted aralkyl group having 1 to 60 carbon atoms, an optionally substituted aryl group having 6 to 60 carbon atoms, an optionally substituted alkoxy group having 1 to 60 carbon atoms, an optionally substituted alkenyloxy group having 1 to 60 carbon atoms, an optionally substituted alkynyloxy group having 1 to 60 carbon atoms, an optionally substituted aralkyloxy group having 1 to 60 carbon atoms, an optionally substituted aryloxy group having 6 to 60 carbon atoms, an optionally substituted alkyl carbonyl group having 1 to 60 carbon atoms, an optionally substituted alkenyl carbonyl group having 1 to 60 carbon atoms, an optionally substituted alkynyl carbonyl group having 1 to 60 carbon atoms, an optionally substituted alalkyl carbonyl group having 1 to 60 carbon atoms, an optionally substituted arylcarbonyl group having 6 to 60 carbon atoms, an optionally substituted alkoxycarbonyl group having 1 to 60 carbon atoms, an optionally substituted alkenyloxycarbonyl group having 1 to 60 carbon atoms, an optionally substituted alkynyloxycarbonyl group having 1 to 60 carbon atoms, an optionally substituted aralkyloxycarbonyl group having 1 to 60 carbon atoms, and/or an optionally substituted aryloxycarbonyl group having 6 to 60 carbon atoms, and R4 is 0 to 4 in the formula (4), and
• R4 is 0 to 3 in the formulas (5) to (7), and
• R2 is a hydrocarbon group having 1 to 1000 carbon atoms, which may contain a heteroatom, and n is an integer of 0 to 2.