Method for catalytically synthesizing 2, 4-dichloronitrobenzene by adopting tetraphenylphosphine iodide
A technology of tetraphenylphosphine iodide and dichloronitrobenzene is applied in the field of preparation of 2,4-dichloronitrobenzene, and can solve the problem of low synthesis rate, low reaction activity, large consumption of ice water, etc. problem, to achieve the effect of improving selectivity and improving reactivity
Pending Publication Date: 2021-07-09
YUNNAN YUNTIANHUA +2
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Abstract
The invention discloses a method for catalytically synthesizing 2, 4-dichloronitrobenzene by adopting tetraphenylphosphine iodide, and relates to the technical field of preparation of 2, 4-dichloronitrobenzene. The method specifically comprises the following steps: adding m-dichlorobenzene and tetraphenylphosphine iodide into a reaction container, uniformly mixing, heating the reaction container, and keeping the temperature of the reaction container at 70 DEG C; then dropwise adding mixed acid into the reaction container at a constant speed, continuously stirring for 2-2.5 hours after dropwise adding is completed within 1.5-2 hours, keeping the temperature at 70 DEG C, and standing for 1.5-2 hours after the reaction is completed; and after layered filtration, washing with cooling water, and drying to obtain the 2, 4-dichloronitrobenzene. Tetraphenylphosphine iodide is added in the nitration reaction process of m-dichlorobenzene, the selectivity of nitration reaction is greatly improved by using the tetraphenylphosphine iodide, the reaction activity is greatly improved, the nitration reaction efficiency is improved to 95% or above, the total reaction efficiency is improved to 92% from 63%, and the standard addition recovery rate of 2, 4-dichloronitrobenzene detected by gas chromatography is 98.9% on average.
Application Domain
Organic-compounds/hydrides/coordination-complexes catalystsNitro compound preparation
Technology Topic
IodideNitrobenzene +6
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