A process for the preparation of high quality 5-(2,5 dioxotetrahydrofuran)-3-methyl-3-cyclohexene-1,2-dicarbonic anhydride

By using maleic anhydride and 3-methyltetrahydrophthalic anhydride as raw materials, combined with non-metallic catalysts and controlled reaction conditions, the problems of low synthesis yield, high cost and dangerous reaction were solved, and the high-quality 5-(2,5-dioxatetrahydrofuran)-3-methyl-3-cyclohexene-1,2-dicarbonic anhydride was efficiently prepared, which is suitable for large-scale production.

CN118772097BActive Publication Date: 2026-06-19CHINATECH (TIANJIN) CHEM CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHINATECH (TIANJIN) CHEM CO LTD
Filing Date
2024-06-28
Publication Date
2026-06-19

AI Technical Summary

Technical Problem

The existing technology for synthesizing 5-(2,5-dioxatetrahydrofuran)-3-methyl-3-cyclohexene-1,2-dicarbonic anhydride has low yield, high production cost, dangerous reaction, and poor product quality.

Method used

High-quality 5-(2,5-dioxatetrahydrophthalic anhydride)-3-methyl-3-cyclohexene-1,2-dicarbonic anhydride was prepared by using maleic anhydride and 3-methyltetrahydrophthalic anhydride as raw materials, combined with non-metallic catalysts such as triphenylmethylphosphoric acid iodide and mercaptoacetic acid, and by controlling the reaction temperature and solvent system, stirring, cooling to precipitate solids and performing post-treatment.

Benefits of technology

It improves synthesis yield, reduces production costs, enhances product quality, ensures safe operation, and is suitable for large-scale production.

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Abstract

The application provides a preparation method of high-quality 5-(2,5-dioxotetrahydrofuran)-3-methyl-3-cyclohexene-1,2-dicarbonic anhydride, which comprises the following steps: S1: mixing maleic anhydride, 3-methyl tetrahydrophthalic anhydride, a catalyst and a solvent, stirring to a certain temperature, heat preservation reaction, after the reaction is completed, a mixed solution is obtained; S2: adding a deionization reagent to the mixed solution, stirring to reduce the temperature to precipitate a solid, and carrying out post-treatment on the precipitated solid to obtain high-quality 5-(2,5-dioxotetrahydrofuran)-3-methyl-3-cyclohexene-1,2-dicarbonic anhydride. The application has the beneficial effects that the preparation method adopts a new process system, the catalyst is low in price, environment-friendly, safe in operation, and high in product quality, and is suitable for large-scale production.
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