2402-78-0Relevant articles and documents
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McKendry,Muelder
, p. 87,94 (1978)
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Catalyst-Free N-Deoxygenation by Photoexcitation of Hantzsch Ester
Cardinale, Luana,Jacobi Von Wangelin, Axel,Konev, Mikhail O.
supporting information, (2020/02/15)
A mild and operationally simple protocol for the deoxygenation of a variety of heteroaryl N-oxides and nitroarenes has been developed. A mixture of substrate and Hantzsch ester is proposed to result in an electron donor-acceptor complex, which upon blue-light irradiation undergoes photoinduced electron transfer between the two reactants to afford the products. N-oxide deoxygenation is demonstrated with 22 examples of functionally diverse substrates, and the chemoselective reduction of nitroarenes to the corresponding hydroxylamines is also shown.
Method for preparing 2,6-dichloropyridine by pyridine liquid-phase photochlorination
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Paragraph 0016-0027; 0028; 0029; 0031, (2019/01/23)
The invention relates to a method for preparing 2,6-dichloropyridine with product purity greater than or equal to 99.0% by using chlorotrifluoromethylbenzene as a solvent for a reaction between pyridine and chlorine. The preparing process comprises the steps as follows: by using the pyridine and the chlorine as initial raw materials and using the chlorotrifluoromethylbenzene as the solvent, continuously performing a chlorination reaction on the pyridine and the chlorine under the irradiation of ultraviolet light; and cooling a chlorination reaction product and the solvent to obtain pyridine chloride solution. The method has the advantages that 1, a precedent of directly preparing the 2,6-dichloropyridine in a high selectivity mode by a liquid-phase photochlorination reaction is set, and not only is the 2,6-dichloropyridine product with purity greater than or equal to 99.0% obtained, but also the method is easy for industrial production; and 2, not only is recycling of the separation solvent in the preparing process of the 2,6-dichloropyridine product with purity greater than or equal to 99.0% implemented, but also the aims of low pollution, low energy consumption and low cost in the preparing process are fulfilled.