Synthesis ,characterization and study thermal properties of some new .benzidine derivatives

Abstract

New 1,3-oxazepine derivatives containing azo group have been prepared. The first step,( benzidine) was converted to 4,4'-bis(3-amino phenol)Azobenzidine [A]. by coupling reactionwith 3-amino phenol, Then amino group of the azo derivative [A] was condensed with differentaromatic aldehydes [4-chlrobenzaldehyde,3-hydroxybenzaldehyde,p-dimethyleaminobenzaldehyde,4 bromobenzaldehyde,4-hydroxy-3-methoxybenzaldehyde,4-chloro-3-hydroxybenzaldehyde,3,4-dimethylbenzaldehyde, and 4-hydroxybenzaldehyde ] in absolute ethanol togive new azo Schiff,s bases derivatives [B1-B8] respectively. The resulting imines derivatives [B1-B8] were reacted with maleic anhydride and phathalic anhydride in dry benzene to give new1,3-oxazepine-4,7-dione ring derivatives[C1a-C8a]and[C1b-C8b] respectively. For the lastderivatives thermal properties were determind by using Thermo gravimetric analysis (TGA),Allthese compounds were characterized by melting points and FT.IR spectroscopy, some of themwere characterized by1H-NMR spectroscopy ,C.H.N analysis and TGA analysis.