56962-09-5Relevant articles and documents
Synthesis method of propanil
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Paragraph 0019; 0023; 0027; 0031; 0035, (2018/11/22)
The invention discloses a synthesis method of propanil. The synthesis method comprises the following steps: firstly performing an acylation reaction on chlorobenzene as a raw material and propionyl chloride to produce p-chloropropiophenone, then performing a condensation reaction on the p-chloropropiophenone and hydroxylamine hydrochloride to produce 1-(4-chlorophenyl)-1-acetoxime, then rearranging the 1-(4-chlorophenyl)-1-acetoxime under an acidic condition, and finally chlorinating to obtain the propanil. By the synthesis method, the reaction selectivity in each step is relatively high, no obvious side reaction occurs and the reaction conversion rate is high, so that the reaction yield is high and the product purity is high; a reaction condition is mild; the raw material cost is low; a requirement on reaction equipment is low; phosphorus-containing wastewater discharge is avoided; extension and tolerance are strong; the conversion success rate from trial production to large-scale production is high, and even if the reaction is interrupted, the trial production can be continued in the later stage; and therefore, the synthesis method is suitable for industrial mass production.
Preparation method of efficient and low-toxicity acaricide hexythiazox
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Paragraph 0018; 0022; 0025; 0028, (2018/10/19)
The invention discloses a preparation method of efficient and low-toxicity acaricide hexythiazox. Performing cyclization reaction on 2-amino-1-(4-chlorphenyl) propyl sulfate hydrochloride and carbon disulfide in a reaction flask under the normal-pressures
Asymmetric Nitrone Synthesis via Ligand-Enabled Copper-Catalyzed Cope-Type Hydroamination of Cyclopropene with Oxime
Li, Zhanyu,Zhao, Jinbo,Sun, Baozhen,Zhou, Tingting,Liu, Mingzhu,Liu, Shuang,Zhang, Mengru,Zhang, Qian
supporting information, p. 11702 - 11705 (2017/09/07)
We report realization of the first enantioselective Cope-type hydroamination of oximes for asymmetric nitrone synthesis. The ligand promoted asymmetric cyclopropene "hydronitronylation" process employs a Cu-based catalytic system and readily available starting materials, operates under mild conditions and displays broad scope and exceptionally high enantio- and diastereocontrol. Preliminary mechanistic studies corroborate a CuI-catalytic profile featuring an olefin metalla-retro-Cope aminocupration process as the key C-N bond forming event. This conceptually novel reactivity enables the first example of highly enantioselective catalytic nitrone formation process and will likely spur further developments that may significantly expedite chiral nitrone synthesis.