Method for preparing 4-nitroso-substituted aromatic amine

A method for preparing a 4-nitroso-substituted aromatic amine, the method comprising:

• contacting a nitroaromatic compound represented by the following formula 3 with an amide compound represented by the following formula 4 in the presence of a base and a solvent to directly prepare a 4-nitroso-substituted aromatic amine represented by the following formula 1 as a main product and a 4-nitro-substituted aromatic amine represented by the following formula 2 as a byproduct in one step:
• wherein Ar is a C4 to C16 aromatic group having at least one ring and containing one or two hetero atoms of N, O or S;
• X is a halogen atom, a cyano group, a C1 to C4 alkyl group, a halongenated C1 to C4 alkyl group, a C1 to C4 alkoxy group, a C1 to C4 halogenated alkoxy group, a C1 to C4 alkylsulfonyl group, or a C1 to C4 alkylnitro group;
• and n is an integer of 0 to 3, wherein Xs are different from one another when n is greater than 1;
• wherein Ar, X and n are as defined above;
• wherein Ar, X and n are as defined above;
• and
• wherein R is a hydrogen atom, a C1 to C8 alkyl group, a C2 to C8 alkenyl group, or a C3 to C7 cycloalkyl group, which substituent may be replaced with 1 to 3 halogen atoms, C1 to C4 alkyl groups, amino groups or C1 to C4 alkoxy groups.