Title of article :
Novel Schiff Bases Derived From Pyromellitic Dianhydride
Author/Authors :
saloom, athraa m. university of baghdad - college of education for pure science ( ibn al -haitham) - department of chemistry, Iraq , fayad, amina a . university of baghdad - college of education for pure science ( ibn al -haitham) - department of chemistry, Iraq , ali, emad t . university of baghdad - college of education for pure science ( ibn al -haitham) - department of chemistry, Iraq
Abstract :
The new Schiff bases derived from pyromellitic dianhydride were synthesized by several
steps reaction . A symmetrical diamic acide [I ]a-c were synthesized by the reaction of
pyromellitic dianhydride 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 :
Schiff Bases , imides , pyromellitic dianhydride
Journal title :
Ibn Alhaitham Journal For Pure and Applied Science
Journal title :
Ibn Alhaitham Journal For Pure and Applied Science
