| 摘要 |
PURPOSE:To prepare the titled compound useful as a raw material of heat-resistant polyamide, etc., economically, in high yield, by the catalytic reduction of easily preparable benzophenone compound in the presence of a reduction catalyst and a dehydrohalogenation agent, followed by dehalogenation. CONSTITUTION:3,3'-Diaminobenzophenone is prepared by reducing 3,3'-dinitro-4- halogenobenzophenone of formula (X is halogen) in the presence of a reduction catalyst (e.g. Pd catalyst, Ni catalyst, etc.) and a dehydrohalogenation agent (e.g. CaCO3, NaOH, etc.), and dehalogenating the reduction product. The starting compound of formula can be prepared easily by the nitration of 4-halogenobenzophenone. The process has various industrial advantages such as no environmental pollution with wastes, omission of troublesome purification process, high purity of the separated product, etc. |
