Open AccessSynthesis and study the liquid crystalline properties of new compounds containing 5-methyl-2,4-dihydro-3H-pyrazol-3-one
Author(s) -
Omar B. Al-Obaidi,
Jumbad H. Tomma
Publication year - 2021
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1818/1/012154
Subject(s) - mesophase , liquid crystal , chemistry , hydrazide , organic chemistry , medicinal chemistry , crystallography , polymer chemistry , materials science , phase (matter) , optoelectronics
The new compounds of pyrazolines were synthesized from the reaction of different acid hydrazide with ethylacetoacetate and ethanol under reflux. These compounds were obtained from many sequence reactions. The 4-acetyl-5-methyl-2,4-dihydro-3H-pyrazol-3-one compounds synthesized from the reaction of 5-methyl-2,4-dihydro-3H-pyrazol-3-one with acetyl chloride in calcium hydroxide and 1,4-dioxane. Finaly, Schiff bases were prepared via condensation reaction of products of mono- and tri ketone derivatives[IV] a, b with phenyl hydrazines as presented in (Scheme 1, 2). The synthesized compounds were identification by using FTIR, NMR and Mass spectroscopy (of some of them). The mesomorphic behaviour of these derivatives were examined under OPM. The compound [IV] a exhibited enantiotropic liquid crystal (Smectic A on heating and Nematic on cooling) while the compound [V] c showed Smectic A and nematic phases only on cooling (monotropic). Also the two compounds [V] a and [VI] b exhibited nematic mesophase on cooling. The compound [IV] b , [V] b, d and [VI]a, c, d did not show any mesomorphic properties.