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Salen metallic catalyst and preparation method

A metal catalyst, fe2 technology, applied in chemical instruments and methods, physical/chemical process catalysts, organic compounds/hydrides/coordination complex catalysts, etc., can solve water and air sensitivity, long reaction cycle, and low catalytic efficiency and other issues to achieve the effect of easy operation, water and air stability

Inactive Publication Date: 2008-12-24
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the catalysts currently used for this reaction still have many problems, such as sensitivity to water and air, low catalytic efficiency, long reaction cycle, etc.

Method used

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  • Salen metallic catalyst and preparation method
  • Salen metallic catalyst and preparation method
  • Salen metallic catalyst and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] a. Synthesis of pyridine organic chloride salt (B)

[0019] Add 0.5 mol (85.5 g) of chlorinated salicylaldehyde and 200 ml of toluene to a 500 ml four-necked flask, protect it with nitrogen gas, add 1 mol (79 g) of pyridine dropwise at 100° C. Evaporate to remove solvent toluene and excess pyridine. After cooling, 150 ml of ethyl acetate was added to wash for 3 times, and vacuum-dried to obtain 100 g of pyridinium chloride salt (B) with a yield of 80%.

[0020] b. Synthesis of pyridine hexafluorophosphate (C)

[0021] Add 0.2mol (50g) of pyridinium chloride salt (B) into a 500ml three-necked flask, 200ml of deionized water, and add 0.2ml (36.8g) of KPF at room temperature 6 , reacted for 48h, washed 5 times with water, and removed the inorganic salt KCl. Rotary evaporation under reduced pressure at 80°C, removal of solvent water to obtain 70.4 g of pyridinium hexafluorophosphate, yield 97%.

[0022] c.SalenH 2 Synthesis of Ligand (D)

[0023] Weigh 0.05 mol (18 g)...

Embodiment 2

[0027] a. The synthesis of triethylamine organic chloride salt (B)

[0028] Add 0.5 mol (85 g) of chlorinated salicylaldehyde and 200 ml of benzene into a 500 ml three-neck flask, add 0.5 mol (50.5 g) of triethylamine dropwise at 100°C, and keep the reaction for 10 hours after dropping, then rotary steam under reduced pressure at 80°C, The solvent benzene was removed. After cooling, 150 ml of ethyl acetate was added to wash for 3 times, and vacuum-dried to obtain 115 g of triethylamine chloride salt (B), with a yield of 86%.

[0029] b. Synthesis of triethylamine nitrate (C)

[0030] In a 500ml three-necked flask, add 0.5mol (136g) of triethylamine chloride salt (B), 200ml of water, and add KNO at room temperature 3 , reacted for 48h, washed 5 times with water, removed KCl, and rotated under reduced pressure at 80°C to remove solvent water to obtain triethylamine nitrate with a yield of 98%.

[0031] c.SalenH 2 Synthesis of Ligand (D)

[0032]Dissolve 0.05 mol of triethyl...

Embodiment 3

[0036] a. Synthesis of organochlorine salt (B)

[0037] Add 0.5 mol (85 g) of chlorinated salicylaldehyde and 200 ml of chloroform into a 500 ml three-neck flask, add 0.5 mol (41 g) of methylimidazole dropwise at 70 ° C, and keep the reaction for 10 h after dropping, and rotate under reduced pressure at 60 ° C to remove Solvent chloroform. After cooling, 150 ml of ethyl acetate was added for washing three times, and vacuum-dried to obtain salicylaldehyde-substituted imidazolium chloride salt (B), with a yield of 86%.

[0038] b. Synthesis of salicylaldehyde-substituted imidazolium tetrafluoroborate (C)

[0039] In a 500ml three-necked flask, add 0.5mol (126.5g) of salicylaldehyde substituted imidazolium chloride salt (B), 200ml of water, and add NaBF at room temperature 4 , reacted for 48h, washed with water for 5 times, and rotated under reduced pressure at 80°C to remove the solvent water to obtain triethylamine tetrafluoroborate with a yield of 99%.

[0040] c.SalenH 2 ...

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Abstract

The present invention relates to a Salen metal catalyst and a preparation method thereof. The Salen metal catalyst is characterized in that substituted salicylaldehyde is reacted with organic base to prepare for and obtain chloride; corresponding organic salt is obtained after ion exchange; the organic salt is reacted with diamine to obtain Salen ligand; then the Salen ligand is reacted with metal slat to obtain the Salen metal catalyst. The prepared Salen metal catalyst has the characteristics of easy operation, being stable in water and air and being dissolved in polar solvent, such as water and ethanol, and the like, easily.

Description

technical field [0001] The invention relates to a synthesis method of a Schiff alkali metal catalyst, in particular to a Salen metal catalyst and a preparation method thereof. Background technique [0002] Salen metal catalysts are widely used in carbon dioxide copolymerization (Acc. Chem. Res., 2004, 37, 836-844; J. Am. Chem. Soc., 2005, 127, 14026-14038). Especially in recent years, the greenhouse effect caused by a large amount of carbon dioxide emissions has been highly valued by countries all over the world. Using carbon dioxide as a carbon resource to copolymerize with epoxy compounds to prepare biodegradable polycarbonate materials is not only a simple method, but also the prepared polymer compounds have excellent properties. , and the cost of raw materials is low and the source is wide, which opens up a new way for the consumption of carbon dioxide and has broad application prospects. However, the catalysts currently used for this reaction still have many problems, ...

Claims

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Application Information

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IPC IPC(8): B01J31/22C07F19/00C07D213/04
Inventor 王勇王从敏李浩然郭丽萍
Owner ZHEJIANG UNIV
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