Cyanuric acid derivatives, discotic liquid crystal materials and detection methods for melamine

A melamine and discotic liquid crystal technology, applied in liquid crystal materials, analytical materials, chemical instruments and methods, etc., can solve the problems of complex separation and the need for melamine detection, and achieve the effects of easy availability of solvents, on-site detection, and obvious phenomena.

Active Publication Date: 2016-08-17
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Technical problem: The present invention provides a cyanuric acid derivative that can solve the existing problems of melamine detection requiring large-scale detection instruments and complicated separation, and can be quickly and reliably detected qualitatively. The melamine detection method using this derivative also provides a disc-shaped liquid crystal material

Method used

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  • Cyanuric acid derivatives, discotic liquid crystal materials and detection methods for melamine
  • Cyanuric acid derivatives, discotic liquid crystal materials and detection methods for melamine
  • Cyanuric acid derivatives, discotic liquid crystal materials and detection methods for melamine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The synthesis method is as follows:

[0038]

[0039] Compound 3,4,5-tris(dodecyloxy)methyl benzoate synthesis general procedure: DMF is dewatered by molecular sieve, gets 150ml DMF and adds in 250ml round bottom flask, adds magneton, adds 16.2g bromide dodeca Alkane, 13.5g anhydrous potassium carbonate, 3g gallic acid. Spherical condensation was refluxed and stirred overnight at 80°C. After cooling to room temperature and filtering, the filtrate was diluted with anhydrous ether, washed with 7% hydrochloric acid solution, distilled water, and saturated sodium chloride solution, and then the solution was washed with anhydrous MgSO 4 Dry, filter and rotary evaporate to obtain a brown solid, and then recrystallize in 30ml of acetone to obtain 11.92g of a white solid as the product.

[0040] The general procedure for the synthesis of compound 3,4,5-tris(dodecyloxy)benzyl alcohol: take a 250ml round-bottomed flask, and place 1.9gLiAlH 4 It was dissolved in 30 ml of a...

Embodiment 2

[0044] The synthesis method is as follows:

[0045]

[0046] Compound 3, the synthetic general procedure of 4-two (dodecyloxy) methyl benzoate: DMF removes water with molecular sieve, gets 150mlDMF and adds in the 250ml round-bottomed flask, adds magneton, adds 14.2g bromododecane, 13.5g anhydrous potassium carbonate, 3g gallic acid. Spherical condensation was refluxed and stirred overnight at 80°C. After cooling to room temperature and filtering, the filtrate was diluted with anhydrous ether, washed with 7% hydrochloric acid solution, distilled water, and saturated sodium chloride solution, and then the solution was washed with anhydrous MgSO 4 Dry, filter and rotary evaporate to obtain a brown solid, and then recrystallize in 30ml of acetone to obtain 9.12g of a white solid as the product.

[0047] Compound 3, the synthetic general steps of 4-bis(dodecyloxy) benzyl alcohol: get 250ml round-bottomed flask, under 0 ℃ ice-water bath nitrogen protection, 1.9g LiAlH 4 It ...

Embodiment 3

[0051] The synthesis method is as follows:

[0052]

[0053] Compound 3,4,5-three (pentanyloxy) methyl benzoate synthetic general steps: DMF removes water with molecular sieves, gets 150mlDMF and adds in 250ml round bottom flask, adds magneton, adds 11.2g bromopentane, 13.5g anhydrous potassium carbonate, 3g gallic acid. Spherical condensation was refluxed and stirred overnight at 80°C. After cooling to room temperature and filtering, the filtrate was diluted with anhydrous ether, washed with 7% hydrochloric acid solution, distilled water, and saturated sodium chloride solution, and then the solution was washed with anhydrous MgSO 4 Dry, filter and rotary evaporate to obtain a brown solid, and then recrystallize in 30ml of acetone to obtain 9.92g of a white solid as the product.

[0054] Compound 3,4,5-tris(pentanyloxy)benzyl alcohol synthesis general steps: take a 250ml round bottom flask, under 0 ℃ ice-water bath nitrogen protection, 1.9gLiAlH 4 It was dissolved in 3...

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Abstract

The invention discloses a cyanuric acid derivative, a disc-like liquid crystal material and a melamine detection method. The liquid crystal material is a cyanuric acid derivative which has the basic characteristics of cyanuric acid and can be connected with melamine serving as a core by hydrogen bonds to form a discotic liquid crystal. The melamine and the specially designed organic molecules are connected together by hydrogen bonds and self-assembled to form a disc-like liquid crystal molecule which is a compound A / M or a compound B / M as shown in the specification, wherein n is 5-40. Such microstructures of the disc-like liquid crystal molecule as color, pattern and texture are changed when observed under a polarizing microscope, thus the melamine can be detected.

Description

technical field [0001] The invention relates to a cyanuric acid derivative, a discoid liquid crystal material and its preparation and application, and at the same time relates to using the liquid crystal material to detect melamine. Background technique [0002] Melamine (Melamine), chemical formula: C 3 h 6 N 6 , commonly known as melamine, protein essence, IUPAC named "1,3,5-triazine-2,4,6-triamino", is a triazine nitrogen-containing heterocyclic organic compound, the structure is It is a white monoclinic crystal, almost odorless, slightly soluble in water, the solubility at room temperature is 3.1g / L, soluble in methanol, formaldehyde, acetic acid, hot glycol, glycerin, pyridine, etc., insoluble in acetone, ether, para It is harmful to the body and cannot be used in food processing or food additives. Since the nitrogen content of melamine 66%wt contains a higher proportion of nitrogen atoms than the average nitrogen content of protein 16%wt, it is used by some counte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D251/32C09K19/34G01N21/84
CPCC07D251/32C09K19/3475G01N21/25G01N21/84
Inventor 杨洪吕友劲宗德超林保平
Owner SOUTHEAST UNIV
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