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Synthesis and Characterization of Novel Schiff Bases Containing Isoxazoline or Pyrazoline Unit | ||
| Ibn Al-Haitham Journal For Pure And Applied Science | ||
| Article 1, Volume 24, Issue 2, 2011, Pages 128-141 | ||
| Authors | ||
| J. H. Tomma; M. S. Khazaal | ||
| Abstract | ||
| This work involves synthesis of novel Schiff bases derivatives contining isoxazoline or pyrazoline units starting with chalcons . 4-Aminoacetophenone was react with p-nitrobenzaldehyde or p-chlorobenzaldehyde in basic medium giving chalcones [I]a,b by claisen-schemidt reactions. The chalcones [I]a,b were reacted with hydroxylamine hydrochloride giving isoxazolines [II]a,b in basic medium. The chalcone [I]a could also reacted with hydrazine hydrate to give pyrazolines [III]a . The novel Schiff bases with structural formula [VIII]n , [IX]n , [X]m and [XI]m were prepared by the reaction of amino compounds ; isoxazoline [II]a,b and pyrazolines [III]a with monoaldehydes [VI]n and dialdehydes [VII]m , respectively in dry benzene using drops of glacial acetic acid as a catalyst with reflux . All the synthesized compounds have been characterized by melting points , FTIR , UV-Vis and 1HMNR (of some of theme) spectroscopy. | ||
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