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Synthesis of dimaleimides |
| T971003 |
Synthesis of dimaleimides
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| Inventor: |
Orphanides |
| Date Issued: |
June 6, 1978 |
| Application: |
05/645,219 |
| Filed: |
December 29, 1975 |
| Inventors: |
Orphanides; Gus George (Newark, DE)
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| Assignee: |
E. I. du Pont de Nemours and Company (Wilmington, DE) |
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| U.S. Class: |
548/522 |
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| Abstract: |
bifunctional maleimides can be prepared in high yield by reacting an organic diamine with maleic anhydride in a solvent composed of the azeotrope of hexamethylphosphoramide or 1-methyl-2-pyrrolidone and acetic acid, followed by dehydration of the intermediate with acetic anhydride in the presence of an alkali metal salt of a C.sub.2 -C.sub.5 aliphatic acid. The solvent systems are recoverable by reduced pressure distillation and can be used in subsequent syntheses of maleimides. |
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