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Method for producing binaphthyl carboxylic acid

A manufacturing method and binaphthyl technology, applied in the preparation of carboxylic acid esters/lactones, separation/purification of carboxylic acid compounds, organic chemistry, etc., can solve problems such as yield or purity reduction

Pending Publication Date: 2022-06-03
HONSHU CHEM INDAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The present inventors noticed for the first time that when the reaction solution is acidic after the above hydrolysis reaction, if alcohol is contained in the reaction solution, the carboxyl group of 2,2'-bis(carboxymethoxy)-1,1'-binaphthyl The acid will react with the alcohol to form an ester, and the yield or purity of 2,2'-bis(carboxymethoxy)-1,1'-binaphthyl will decrease

Method used

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  • Method for producing binaphthyl carboxylic acid
  • Method for producing binaphthyl carboxylic acid
  • Method for producing binaphthyl carboxylic acid

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Embodiment

[0020] Hereinafter, the present invention will be described more specifically with reference to examples, but the present invention is not limited to these examples.

[0021]

[0022]

[0023] The purity of the first-time crystallized crystal of Example 1 was 99.7%, and the content of the monoethyl ester body was 0.2%. On the other hand, the purity of the first crystallization crystal of Comparative Example 1 was 98.3%, the monoethyl ester content was 1.6%, and even in the second crystallization crystal, the purity was 99.2%, and the monoethyl ester content was 99.2%. The ester content was 0.7%. From this result, it was confirmed that the production method of the present invention including the step (ii) is an excellent production method for obtaining high-purity 2,2'-bis(carboxymethoxy)-1,1'-binaphthyl.

[0024]

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Abstract

The present invention addresses the problem of providing a method for producing 2, 2 '-bis (carboxylmethoxy)-1, 1'-binaphthalene with high purity. As a solution, provided is a method for producing a 2, 2 '-bis (carboxylmethoxy)-1, 1'-binaphthalene represented by formula (2), which is characterized in that a 2, 2 '-bis (alkoxycarbonylmethoxy)-1, 1'-binaphthalene represented by formula (1) is used as a starting material and the following steps (i) to (iv) are performed in this order: (i) a hydrolysis reaction step; (ii) a step for distilling off the generated alcohol represented by formula (3) from the reaction system; (iii) a step in which the reaction liquid is acidic; and (iv) a step for precipitating 2, 2 '-bis (carboxylmethoxy)-1, 1'-binaphthalene in the presence of an organic solvent.

Description

technical field [0001] The present invention relates to a method for producing binaphthylcarboxylic acids. Background technique [0002] In recent years, polyester resins or polyester carbonate resins using a dicarboxylic acid component having a binaphthyl skeleton as a polymerization component are expected to be excellent in optical properties such as high refractive index and low birefringence, and have a high degree of heat resistance. This is used as a raw material for optical components such as optical discs, transparent conductive substrates, and filters. Among them, resins produced by using 2,2'-bis(carboxymethoxy)-1,1'-binaphthyl having a chemical structure represented by the following chemical formula as a polymerization component are particularly attractive due to their excellent optical properties. (For example, Patent Documents 1 to 3, etc.). [hua 1] As a production method of 2,2'-bis(carboxymethoxy)-1,1'-binaphthyl represented by the above chemical form...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C59/66C07C51/09C07C51/43
CPCC07C59/66C07C51/09C07C51/43C07C59/31
Inventor 佐久间大地须藤健
Owner HONSHU CHEM INDAL
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