Novel Schiff Bases Derived From Pyromellitic Dianhydride | ||
| Ibn Al-Haitham Journal For Pure And Applied Science | ||
| Article 1, Volume 27, Issue 3, December 2014, Pages 479-493 | ||
| Authors | ||
| Athraa M. Saloom; Amina A. Fayad; Emad T .Ali | ||
| Abstract | ||
| The new Schiff bases derived from pyromelliticdianhydride were synthesized by several steps reaction . A symmetrical diamicacide [I ]a-c were synthesized by the reaction of pyromelliticdianhydride with some aromatic amines (containing electron withdrawing , repulling groups ) in dry acetone. In the second step the diacids were converted to their corresponding diimide [II ]a-c using acetic anhydride and sodium acetate system as a dehydrating agent, via the intra molecular cyclization steps of amic acids. The third step was to synthesize the hydrazone derivatives from the reaction of diimides , with 80 % hydrazine hydrate at (50-60)C˚ . These hydrazone derivatives were allowed to react with several aromatic aldehydes to form new Schiff bases via step four at a temperature near by (50)C˚ . All the novel compounds and their structures have been ascertained by their melting points , mixed melting points , C .H . N analysis , FTIR spectroscopy and HNMR for some of them . | ||
| Keywords | ||
| pyromelliticdianhydride; imides; Schiff bases | ||
|
Statistics Article View: 41 PDF Download: 11 |
||