Open AccessSynthesis, identification and study of mesomorphic properties of compounds containing two C2H2N2O rings
Author(s) -
Omar B. Al-Obaidi,
Jumbad H. Tomma
Publication year - 2021
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/1145/1/012055
Subject(s) - hydrazide , carboxylic acid , benzoic acid , chemistry , mesophase , yield (engineering) , organic chemistry , acrylic acid , maleic acid , polymer chemistry , materials science , polymer , copolymer , metallurgy , phase (matter)
The novel compounds of 1,3,4-C2H2N2O were manufactured from the response of acid hydrazides with carboxylic acids using POCl 3 under reflex. These compounds were obtained from many sequence reactions as in Scheme 1. Converted anasic acid to acorresponding ester and acid hydrazid. The acid hydrazide used as starting materials for synthesis new carboxylic acid [IV] via condensation the acid hydrazide with 4-aminobenzoic acid in POCl 3 to yield compound [III]. Then, the later compound coupling with benzoic acid in suitable conditions to formation compound [IV]. Also this new carboxylic acid [IV]converted to a corresponding ester and acid hydrazide. Finally, the synthesized acid hydrazides [VI] reacted with different type of carboxylic acid in POCl 3 to get new derivatives of 1, 3, 4-C2H2N2O in two synthetic routs. The novel compounds were identified by using FTIR, NMR and Mass spectroscopy. The behaviour of these derivatives was examined under OPM and DSC. Compounds [IV], [VIII] 1 and [XI] a exhibited nematic mesophase, while the other compounds [V], [VI], [VIII]3, 4, 5, 8, 9 and [XI] b, c did not show any mesomorphic properties.