Synthesis of New Asymmetrical Pyromellitdiimide and Their Amic Acids Containing Heterocyclic Unit | ||
| Ibn Al-Haitham Journal For Pure And Applied Science | ||
| Article 1, Volume 27, Issue 1, April 2014, Pages 234-246 | ||
| Authors | ||
| Jumbad H.Tomma; Kadhim M.Lazim AL-Aliawi; Imad T. Ali | ||
| Abstract | ||
| This work involves the synthesis and characterization of asymmetrical pyromellitdiimide derivatives [VII]a-f by four sequences steps reaction . One mole of pyromellitic dianhydride was reacted with one mole of various primary aromatic amines [2-aminothiazole , 2-aminobenzothiazole , 5-(4-amino phenyl)-1,3,4-oxadiazole-2-thiol , 4-nitro aniline , 4-chloro aniline , 4-toludine] in excess of dry acetone to produce six compounds (N-substituted-pyromellitamic monoacid) [IV]a-f . These new compounds [IV]a-f were converted to the corresponding N- substituted- pyromellitmonoimide [V]a-f when heating then at (80-90) 0C in sodium acetate-acetic anhydride system .The compounds [V]d-f were allowed to react with one mole of another primary amines (containing benzothiazole or 1,3,4-oxadiazole unit) in dry acetone to give new derivatives of amic acid [VI]a-f followed by intramolecular cyclization reaction of these compounds in sodium acetate-acetic anhydride system to yield the desired asymmetrical pyromellitdiimide derivatives [VII]a-f, the above reactions can be summarized in Scheme 1. Structures of the synthesized compounds have been ascertained by their melting points , C.H.N analysis , UV-Vis, FTIR and 1HNMR spectroscopy. | ||
| Keywords | ||
| Asymmetrical pyromellitdiimide; Pyromellitic dianhydride; pyromellitamic monoacid; pyromellitmonoimide | ||
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