Claims
- 1. 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.
- 2. The process according to claim 1 wherein N,N'-disubstitution is N,N'-dialkyl.
- 3. The process according to claim 2 wherein said N,N'-dialkyl is N,N'-dimethyl.
Parent Case Info
This is a division of Ser. No. 935,201, filed Aug. 21, 1978, now U.S. Pat. No. 4,193,924; which is a division of Ser. No. 802,168, filed May 31, 1977, now U.S. Pat. No. 4,125,536, patented Nov. 14, 1978; which is a division of Ser. No. 603,221, filed Aug. 8, 1975, now U.S. Pat. No. 4,056,542, patented Nov. 1, 1977; which is a division of Ser. No. 360,962, filed May 16, 1973, now U.S. Pat. No. 3,932,457, patented Jan. 13, 1976. Related application Ser. No. 935,195, filed Aug. 21, 1978, now U.S. Pat. No. 4,163,014, 7-31-1979 also is a division of Ser. No. 802,168. See also related divisional application Ser. No. 76,707, filed Sept. 18, 1979, now allowed, concurrently herewith.
Non-Patent Literature Citations (1)
Entry |
Gschwend et al., J. Org. Chem. 37, 59-61 (1972). |
Divisions (4)
|
Number |
Date |
Country |
Parent |
935201 |
Aug 1978 |
|
Parent |
802168 |
May 1977 |
|
Parent |
603221 |
Aug 1975 |
|
Parent |
360962 |
May 1973 |
|