A PROCESS FOR THE PREPARATION OF 3-AND 4-AMINOPHTHALIMIDE.

摘要

The invention discloses a simple, economical, and effluents-free process for the preparation of 3- and 4-aminophthalimides of formula (I) by reduction of the corresponding nitrophthalimides of formula (II) under heterogeneous hydrogenation conditions using Pd, Pt, Ni catalysts at different temperature in the presence of polar solvent selected from diemthylformamide, dimethylacetamide, N-methyl-2-pyrrolidone in the presence or absence of alcoholic solvent. The 3- and 4-aminophthalimide of formula (I) prepared by the process of the present invention are useful as dyestuff intermediates. The compounds are suitable for use as fluorescent dyes for artificial fibers and natural vegetable and animal fibers. They are also useful as synthetic intermediates for the preparation of 5-bromophthalide, an intermediate for the preparation of citalopram.