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A kind of preparation method of 2,6-diaminopyridine condensed o-carboxybenzaldehyde bis-Schiff base cobalt complex

A technology of formaldehyde double Schiff base cobalt and formaldehyde double Schiff base, which is applied in the field of preparation of 2,6-diaminopyridine-o-carboxybenzaldehyde double Schiff base cobalt complexes, and can solve side reactions and unfavorable products Purification and characterization, etc., to achieve the effect of good repeatability, easy promotion and application, and simple process

Active Publication Date: 2020-01-21
GUILIN UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

The advantages of this method are fast reaction, high yield, and convenient and simple operation; the disadvantage is that side reactions occur, which is not conducive to the purification and characterization of the product.

Method used

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  • A kind of preparation method of 2,6-diaminopyridine condensed o-carboxybenzaldehyde bis-Schiff base cobalt complex
  • A kind of preparation method of 2,6-diaminopyridine condensed o-carboxybenzaldehyde bis-Schiff base cobalt complex

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Embodiment

[0024] The present invention is further illustrated below in conjunction with specific examples, but the examples do not limit the protection scope of the present invention.

[0025] (1) Weigh 0.6000 g (4 mmol) of o-carboxybenzaldehyde and dissolve it in 10 mL of absolute ethanol, and stir evenly with a magnetic force to obtain a colorless, transparent and clear solution.

[0026] (2) Dissolve 0.2180 g (2 mmol) of 2,6-diaminopyridine in 5 mL of absolute ethanol, then slowly drop the colorless and transparent solution obtained in step (1), under nitrogen protection, at 65°C The reflux reaction was carried out for 4 hours, and a precipitate was formed. After standing, cooling, and suction filtration, a precipitate was obtained.

[0027] (3) The precipitate obtained in step (2) was purified successively by beating method and recrystallization method, and after vacuum drying, a light gray powder was obtained, which was 2,6-diaminopyridine-o-carboxybenzaldehyde bis-Hydroxy Kufine ...

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Abstract

The invention discloses a preparation method of a 2,6-diaminopyridine condensed o-carboxybenzaldehyde bis-Schiff base cobalt complex. Take 2,6-diaminopyridine and o-carboxybenzaldehyde as raw materials, use absolute ethanol as a solvent, and do not need to add a catalyst to prepare 2,6-diaminopyridine-o-carboxybenzaldehyde bis-Schiff base, and then 2,6-diaminopyridine-o-carboxybenzaldehyde double-Schiff base is used as a ligand, and reacts with cobalt acetate in alkaline aqueous solution to prepare 2,6-diaminopyridine-o-carboxybenzaldehyde double-Schiff base cobalt complex things. The method of the invention does not need to add a catalyst, has the advantages of simple process, good repeatability and high yield, and is convenient for popularization and application.

Description

technical field [0001] The invention belongs to the technical field of organic synthesis, and in particular relates to a preparation method of a 2,6-diaminopyridine adenocarboxybenzaldehyde bis-Schiff base cobalt complex. Background technique [0002] Schiff base is a kind of compound with imino (-C=N-) or imino (-RC=N-) structure formed by the condensation reaction of active amine compounds and carbonyl compounds. The N atom in the C=N bond of this type of compound contains a lone pair of electrons, so this type of compound has good coordination activity. There are many types of Schiff bases, and the synthesis method is simple. Researchers can flexibly choose amines and carbonyl-containing aldehydes or ketones to react to obtain Schiff bases. Various metal elements form metal complexes. [0003] The synthesis of Schiff base is a reaction involving nucleophilic addition, that is, through addition, elimination, rearrangement and other reactions of amine compounds as nucleop...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07F15/06C07D213/74
CPCC07D213/74C07F15/065
Inventor 刘峥李海莹韩佳星廖秋梅
Owner GUILIN UNIVERSITY OF TECHNOLOGY