GABRIELA RAU, DENISA CONSTANTINA AMZOIU, ANCA MIHAELA STOIAN (BULEARCA), CAMELIA ELENA STANCIULESCU, CATALINA GABRIELA PISOSCHI RESEARCHES CONCERNING THE SYNTHESIS, PHYSICO-CHEMICAL AND LIQUID CRYSTAL PROPERTIES OF NEW AZOMONOETHERAMIDES
The synthesis of some novel azomonoetheramides, five 4-(N-phenylacetamidoxy) azobenzenes and three 4-(N-phenylacetamidoxy)-4’-(phenylazo) biphenyls, was completed through condensation of some 4(phenylazo) phenols or 4-hydroxy-4’-(phenylazo) biphenyls, 4-hydroxy-4’- (p-chloro-phenylazo) biphenyl, 4-hydroxy-4’-(p-methyl-phenylazo) biphenyl, in alkaline medium, with 4-ethoxy-N-chloroacetylaniline. The purification of compounds was achieved by recrystallization from toluene. The purity degree was checked by gas chromatography. The compounds were solid, with different colours, and with high melting points. Their structures were established both by elemental and spectral analysis (UV–Vis, FTIR, 1H–NMR, GC–MS). The liquid crystal properties were studied by polarizing optical microscopy (POM) and differential scanning calorimetry (DSC).