High purity and high yield synthesis of dianhydrides

Details High purity and high yield synthesis of dianhydrides High purity and high yield synthesis of dianhydrides

1990-01-26

1995-05-09

Bernhardt, Emily

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

549234, 549235, 549240, C07D30706

Patent

active

054140943

ABSTRACT:
A process for making a dianhydride product, said process comprising reacting two moles of maleic anhydride and one mole of a vinyl benzene compound in a reaction mixture comprising about 1.5 to 2.0 moles of the vinyl benzene compound per mole of maleic anhydride at reaction temperature in the range from 105.degree. to 125.degree. C. for time to complete the reaction, adding a polar organic liquid to the reaction product mixture and refluxing the mixture, cooling the mixture following reflux and adding a hydrocarbon liquid to precipitate the product, separating the solid dianhydride product by filtration, washing the solids on the filter and drying the solids to make the finished dianhydride product.

REFERENCES:
patent: 3410876 (1968-11-01), Ralph
patent: 3769304 (1973-10-01), Saluti
patent: 4614808 (1986-09-01), Jurgen

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