2808-86-8Relevant articles and documents
Resourceful treatment method of picloram solid residues
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Paragraph 0059-0064, (2020/11/23)
The invention relates to a picloram solid residue resourceful treatment method which comprises the following steps: a) carrying out decarboxylation reaction on picloram solid residues, performing filtering, taking filtrate, and separating out solid; b) sequentially carrying out diazotization and chlorination reaction on the solid obtained in the step a), separating out the solid, performing filtering, taking a filter cake, and performing separating to obtain 2, 3, 4, 5-tetrachloropyridine; c) subjecting the 2, 3, 4, 5-tetrachloropyridine obtained in the step b) to a dechlorination reaction soas to obtain 2, 3, 5-trichloropyridine and/or 2, 5-dichloropyridine. According to the resourceful treatment method provided by the invention, the picloram solid residues can be converted into 2, 3, 5-trichloropyridine products with good market demand prospects and relatively high economic values, and further efficient utilization of the picloram solid residues is realized.
Method for preparing 2,3,5-trichloropyridine
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Paragraph 0057; 0061; 0062, (2018/09/08)
The invention relates to the field of compound preparation, and discloses a method for preparing 2,3,5-trichloropyridine, wherein the method comprises the following steps: a. in the presence of a chlorination catalyst, a compound A is contacted with chlorine for chlorination reaction to obtain a mixture containing the 2,3,5-trichloropyridine and 2,3,4,5-tetrachloropyridine; b. the mixture obtainedin the step a is contacted with hydrogen in the presence of a hydrogenation catalyst and a solvent to carry out catalytic hydrogenation reaction; or, the 2,3,5-trichloropyridine and the 2,3,4,5-tetrachloropyridine in the mixture obtained in the step a are separated, the separated 2,3,4,5-tetrachloropyridine is contacted with the hydrogen for catalytic hydrogenation reaction; wherein the compoundA is 2-chloropyridine and / or 2-chloropyridine hydrochloride. The raw materials in the method are simple and easy to obtain, the operating conditions are mild, the product yield is high, the cost islow, the pollution is small, and the method is suitable for large-scale application.
DESTRUCTIVE CHLORINATION OF 3,4,5-TRICHLORO-2-(TRICHLOROMETHYL)PYRIDINE
Emel'yanov, V. I.,Stul', B. Ya.,Korolev, B. M.
, p. 1168 - 1171 (2007/10/02)
The extensive destructive chlorination of 3,4,5-trichloro-2-(trichloromethyl)pyridine proceeds by both thermal (160-245 deg C) and photochemical pathways.Perchloropyridine, perchloropicoline, and carbon tetrachloride are formed.The chlorinated derivatives of pyridine are formed by the loss of the CCl3 group with its subsequent replacement by a chlorine atom.
Polyhalogenoaromatic Compounds. Part 43. Inter- and Intra-molecular Reactions of Polychloroaromatic Compounds with Copper
Mack, Arthur G.,Suschitzky, Hans,Wakefield, Basil J.
, p. 1682 - 1687 (2007/10/02)
The reaction of polychloroiodoarenes with copper in dimethylformamide gives good yields of the biaryls. 4-Bromotetrachloropyridine gives products of halogen exchange and reduction as well as coupling.Pentachloropyridine gave only tetrachloropyridines.Evidence against free radical or pyridyne intermediates is presented, and it is postulated that the reactions proceed via pyridylcopper compounds, although an electron transfer mechanism is not excluded.On reaction with copper, some 4-(o-halogenophenoxy)- and 4-(o-halogenothiophenoxy)-tetrahalogenopyridines give products of cyclisation, reduction, and halogen transfer.Copper reacts initially, at least in part, with the pyridyl group rather than with the o-halogenoaryl group.The results are again consistent with a reaction pathway involving a pyridylcopper intermediate.The products of nucleophilic substitution in pentahalogenopyridines by some phenols, thiophenols, and anilines are reported.
