Patent ID: 6552229
Filing Date: 2003-04-22
Classification: C07C

Abstract:
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.