Method for synthesizing symmetrical compound of aroma urea group

A compound, aromatic urea technology, which is applied in the field of synthesizing symmetrical aromatic urea compounds, can solve problems such as unfavorable industrialization, and achieve the effect of less equipment investment, simple and safe operation
CN1626510AInactive Publication Date: 2005-06-15DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
Publication Date
2005-06-15
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

A process for synthesizing the symmetric arylurea compound features that the aromatic nitro compound takes part in carbonylation reaction in organic solvent under existance of CO, Se powder as catalyst and alkali as cocatalyst to obtani target produst. The Se powder is then oxidized by O2 or air for separating it out and reusing it.
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Description

technical field

[0001] The invention relates to a method for synthesizing symmetrical aromatic urea compounds, in particular to a method for synthesizing symmetrical aromatic urea compounds through selenium-catalyzed carbonylation of aromatic nitro compounds using carbon monoxide under normal pressure. Background technique

[0002] Symmetrical aromatic ureas are a large class of important organic synthesis intermediates and raw materials. The previous synthesis methods used highly toxic phosgene and produced a large amount of chlorine-containing by-products during the reaction process, which caused serious corrosion to the equipment. Bigger trouble, so people began to look for non-phosgene methods.

[0003] Catalytic carbonylation of amines or nitro compounds into urea with complexes of transition metals (such as Pd, Rh, Ru) has been reported, but obtaining high yields requires more catalysts, which is unfavorable for industrialization [Ahmcd.M.T; Jens.W .Chem.Rev.1996.94.1...

Claims

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