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Применить Всего найдено 4. Отображено 4.
23-05-2019 дата публикации

METHOD FOR PREPARING 2,2'-DIPYRIDINE AND DERIVATIVES THEREOF

Номер: WO2019095613A1
Автор: LUO, Chaoran, WANG, Wenkui, XUE, Yi, CHEN, Xinchun, ZHOU, Dianhai, JIANG, Jianhua, WANG, Fujun
Принадлежит:

Disclosed is a method for preparing 2,2'-dipyridine and derivatives thereof. The method comprises: using pyridine represented by formula I or a derivative thereof as a raw material to generate 2,2'-dipyridine represented by formula II by performing dehydrogenative coupling under the action of a supported catalyst in the presence of additives, wherein R is H, C1-C2 alkyl, Cl, or Br. The method of the present invention features wide adaptability to raw materials, high atomic utilization rate, high catalyst activity, long service life, and fewer by-products.

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Номер записи: 1
07-03-2019 дата публикации

METHOD FOR PREPARING 1,1'-ETHYLENE-2,2'-BIPYRIDYL DICHLORIDE SALT

Номер: WO2019041462A1
Автор: YUE, Ruikuan, XUE, Yi, CHEN, Honglong, WANG, Wenkui, LUO, Chaoran, CHEN, Xinchun, ZHOU, Dianhai, JIANG, Jianhua, WANG, Fujun
Принадлежит:

Disclosed is a method for preparing 1,1'-ethylene-2,2'-bipyridyl dichloride salt, the method involving mixing an aqueous solution of diquat dibromide with hydrochloric acid, and then dropwise adding same to a mixed solution of an organic solvent, a bromine absorbent and an oxidant for reaction to obtain the 1,1'-ethylene-2,2'-bipyridine dichloride salt.

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Номер записи: 2
18-07-2023 дата публикации

Preparation process of 2, 2 '-dipyridyl

Номер: CN116444423A
Автор: ZHANG WEIWEI, LUO CHAORAN, CHEN HONGLONG, CHEN JIZHEN, WANG FUJUN, WANG WENKUI, DU XIANG, JIANG JIANHUA
Принадлежит:

The invention discloses a preparation process of 2, 2 '-dipyridyl, and relates to the technical field of dipyridine.The method comprises the steps that pyridine serves as a raw material, a fixed bed serves as a reactor, under the action of a loaded nickel catalyst, coupling reaction is conducted to generate 2, 2'-dipyridyl, the nickel content in the loaded nickel catalyst is 62-65%, and a carrier of the loaded nickel catalyst is modified silicon oxide; the specific preparation process comprises the following steps: S01, loading a nickel-loaded catalyst into a fixed bed reactor, activating for 2-3 hours, and heating to a reaction temperature; s02, pyridine and an additive are mixed according to a certain proportion, then the mixed solution is injected into the fixed bed reactor, and 2, 2 '-dipyridine.The activity of the loaded nickel catalyst is higher, and through the catalytic reaction of the loaded nickel catalyst, the prepared 2, 2'-dipyridineis high in conversion rate and long in service ...

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Номер записи: 3
23-06-2023 дата публикации

Preparation process of L-glufosinate-ammonium

Номер: CN116287043A
Автор: YUE RUIKUAN, CHEN HONGLONG, CHEN JIZHEN, WANG FUJUN, DU XIANG, JIANG JIANHUA, ZHANG WEIWEI
Принадлежит:

The invention discloses a preparation process of L-glufosinate-ammonium, and relates to the technical field of glufosinate-ammonium, D, L-glufosinate-ammonium is used as a raw material, L-glufosinate-ammonium is obtained through catalysis of a catalyst, and the specific preparation process comprises the following steps: S01, deracemization: DL-glufosinate-ammonium is added into a 1mol/L ammonium formate solution, stirring and mixing are performed to obtain a mixed solution, adding a catalyst L-arabinose isomerase mutant into the mixed solution for reaction, and obtaining a reaction solution after the reaction is completed; s02, separating and concentrating; and S03, refining. The L-arabinose isomerase mutant is added as a biocatalyst, the catalytic activity and the conversion rate are higher, the asymmetric synthesis method is adopted, and the prepared L-glufosinate-ammonium is refined and purified, so that the process route complexity and the wastewater amount are reduced, the yield of ...

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Номер записи: 4