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A method for the selective reduction of aromatic nitro compounds to prepare aromatic amines when iron oxide/Fe(ii) coexists

An aromatic nitro, iron oxide technology, applied in the preparation of amino compounds, chemical instruments and methods, preparation of organic compounds, etc., can solve the problems of reducing production costs, environmental pollution, etc., and achieves cost reduction, high reduction selectivity, and reaction mild conditions

Active Publication Date: 2017-06-06
HEBEI CAIKE CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for preparing aromatic amines using iron oxide as a catalyst and ferrous iron as a reducing agent. This method reduces the production cost and solves the problem of environmental pollution caused by iron sludge produced by the reduction of iron powder

Method used

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  • A method for the selective reduction of aromatic nitro compounds to prepare aromatic amines when iron oxide/Fe(ii) coexists
  • A method for the selective reduction of aromatic nitro compounds to prepare aromatic amines when iron oxide/Fe(ii) coexists
  • A method for the selective reduction of aromatic nitro compounds to prepare aromatic amines when iron oxide/Fe(ii) coexists

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Embodiment Construction

[0011] The present invention relates to a method for reducing aromatic nitro groups to aromatic amino groups as shown below,

[0012] Aryl-NO 2 →Aryl-NH 2

[0013] Among them, Aryl is an aromatic group, and the method uses iron oxide as a catalyst and divalent iron as a reducing agent.

[0014] More specifically, in the aforementioned method, wherein the aromatic group is C 6 -C 10 Aryl.

[0015] More specifically, in the aforementioned method, wherein the aromatic group is selected from phenyl or naphthyl.

[0016] More specifically, in the foregoing method, wherein the aromatic group is optionally selected by one or more R groups independently selected from electron withdrawing groups or electron donating groups 1 Group substituted.

[0017] More specifically, in the aforementioned method, wherein the R 1 Selected from C 1-6 Alkyl, C 1-6 Alkoxy, cyano, hydroxyl, halogen, -SO 3 H, -COOH (list a series of groups).

[0018] The present invention also relates to a method for preparing 4,4'-...

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Abstract

The invention discloses a method for selectively reducing and preparing arylamine through aromatic nitro compounds when ferric oxide / Fe(II) coexists. The new process which is gentle in reaction condition, simple in device, high in product yield, stable in quality, small in environment pollution and capable of achieving large-scale production is provided for catalyzing reducing and preparing arylamine compounds through nitrocompounds.

Description

Technical field [0001] The invention relates to a method for liquid-phase reduction of aromatic nitro compounds. Specifically, the present invention relates to a method for reducing aromatic nitro compounds with divalent iron using iron oxide as a catalyst. More specifically, the present invention relates to the selective reduction of 4,4'-dinitrostilbene-2,2' -Method for preparing 4,4'-diaminostilbene-2,2'-disulfonic acid from disulfonic acid. Background technique [0002] Catalytic reduction of aromatic nitro compounds to prepare aromatic amines is a very important unit reaction in the dye, medicine and perfume industries. Commonly used are catalytic hydrogenation, iron powder reduction, and alkali sulfide reduction. Catalytic hydrogenation is a clean reduction method, but first requires a hydrogen source, which needs to be reacted in a closed high-pressure system, which requires high safety precautions and high investment in equipment. It is often used in the production of l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C309/46C07C303/22C07C211/47C07C209/36
Inventor 魏雨张国福段卫东戈弋王红强张中领
Owner HEBEI CAIKE CHEM CO LTD
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