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US 4,233,218 AGranted
Pyrolysis of N-substituted-1-cyclohexene-1,2-dicarboximides
AssigneePhillips Petroleum Company
InventorRaymond L. Cobb
Life of this patent
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Abstract
Pyrolysis of N-substituted-1-cyclohexene-1,2-dicarboximide gives N,N'-substituted-pyromellitdiimides. Pyrolysis of N-substituted-1-cyclohexene-1,2-dicarboximide in the presence of N-substituted maleimides produces N,N'-substituted-3,4,5,6-tetrahydropyromellitdiimide and the Diels-Alder dimer of N-substituted-1,3-butadiene-2,3-dicarboximide.
Claims3
The process for preparing N,N'-dialkyl or diphenyl-pyromellitdiimides and the dimers of N-alkyl or phenyl-1,3-butadiene-2,3-dicarboximides, which comprises pyrolyzing N-phenyl- or N-alkyl-1-cyclohexene-1,2-dicarboximides under pyrolysis conversion conditions,
- wherein said pyrolysis conversion conditions include elevated temperatures in the range of about 500.degree. C. to 1000.degree. C., reduced pressure, and short contact time, effective for said pyrolysis.
Dependencies are inferred from the claim text.