KR970010725A - Method for preparing polyhydroxy benzophenone - Google Patents

Abstract

The following general formulas (II) and (III) are prepared in the presence of aluminum chloride or zinc chloride to prepare a compound of formula (IV) using chloroform, dichloroethane, acetonitrile, xylene, and the like, which are aluminum chloride or sodium cyanide. The process for preparing polyhydroxy benzophenone, which reacts with the compound of formula (I), yields a very high yield and a high purity product, and also a novel polyhydroxy benzophenone derivative capable of selectively converting a methoxy group to a hydroxy group. It is a manufacturing method of.

(Wherein R ₃ and R ₄ are methyl or ethyl groups and R ₁ , R ₂ , n, m are as defined above).

Description

Method for preparing polyhydroxy benzophenone

As this is a public information case, the full text was not included.

Claims (7)

Preparing a mixed solution by dissolving and mixing the following methoxyaromatic carboxylic acid of the general formula (II) and the methoxybenzene of the general formula (III) below in a solvent; Preparing a suspension solution by suspending a compound selected from the group consisting of aluminum chloride or zinc chloride in a solvent; Adding the above-mentioned suspension solution to the above-mentioned mixed solution and reacting to prepare a benzophenone derivative of the general formula (IV) shown below; Adding a aluminum chloride solution to the benzophenone derivative to react the reaction; The manufacturing method of the dihydroxy dimethoxy benzophenone derivative of the following general formula (I) containing. (Wherein R ₁ , R ₂ are each independently a methyl group or hydrogen, R ₃ , and R ₄ are each independently a methyl group or an ethyl group, m and n are each the same or different and are integers from 0 to 3). The method of claim 1, wherein the solvent is selected from the group consisting of chloroform, dichloroethane, acetonitrile and xylene. The method of claim 1, wherein the solvent of the aluminum chloride solution is dichloroethane. Preparing a mixed solution by dissolving and mixing the following methoxyaromatic carboxylic acid of the general formula (II) and the methoxybenzene of the general formula (III) below in a solvent; Preparing a suspension solution by suspending a mixture selected from the group consisting of aluminum chloride or zinc chloride in a solvent; Adding the above-mentioned suspension solution to the above-mentioned mixed solution and reacting to prepare a benzophenone derivative of the general formula (IV) shown below; Reacting the benzophenone derivative by adding sodium cyanide solution; The manufacturing method of the tetrahydroxy benzophenone derivative of the following general formula (V) containing. (Wherein R ₁ and R ₂ are each independently a methyl group or hydrogen, R ₃ and R ₄ are each independently a methyl group or an ethyl group and m and n are each the same or different and are an integer from 0 to 3). The method according to claim 4, wherein the solvent is selected from the group consisting of chloroform, dichloroethane, acetonitrile and xylene. The method of claim 4, wherein the solvent of the sodium cyanide solution is dimethyl sulfoxide. Preparing a mixed solution by dissolving and mixing the following methoxyaromatic carboxylic acid of the general formula (II) and the methoxybenzene of the general formula (III) below in a solvent; Preparing a suspension solution by suspending a mixture selected from the group consisting of aluminum chloride or zinc chloride in a solvent; Adding a suspension solution to the mixed solution and reacting the same; The manufacturing method of the benzophenone derivative of the following general formula (IV) containing. (Wherein R _{1 and} R ₂ are each independently a methyl group or hydrogen, R ₃ and R ₄ are each independently a methyl group or an ethyl group and m and n are the same or different and are integers of 0 to 3). ※ Note: The disclosure is based on the initial application.