3757-76-4Relevant articles and documents
Preparation method for 2,4-dichlorophenoxyacetic acid
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, (2018/09/29)
The invention provides a preparation method for 2,4-dichlorophenoxyacetic acid. The preparation method comprises the following steps: reacting phenol with a chloridizing agent under the action of a catalyst so as to obtain 2,4-dichlorophenol, wherein the catalyst is a composite catalyst composed of at least one metallic compound and at least one ether compound; reacting 2,4-dichlorophenol with analkaline compound so as to obtain 2,4-dichlorophenate; reacting haloacetic acid with an alkaline compound so as to obtain haloacetate; reacting the 2,4-dichlorophenate with the haloacetate so as to obtain 2,4-dichlorophenoxyacetate; and acidifying the 2,4-dichlorophenoxyacetate so as to obtain 2,4-dichlorophenoxyacetic acid. According to the invention, the specific composite catalyst is added in the chlorination process of phenol, so the prepared 2,4-dichlorophenoxyacetic acid contains few by-products, has high purity and yield, and is friendly to environment.
REACTIONS OF ARENEDIAZOHYDROXIDE SELENOUS ESTERS WITH PHENOLS
Nesynov, E. P.,Aldokhina, T. F.
, p. 352 - 355 (2007/10/02)
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