Synthesis and Characterization of Novel Liquid Crystalline Compounds Containing a Pyrazole Ring

Symmetric 3,5-pyrazole and isoxazole heterocycles comprising a bent core unit: synthesis and mesomorphic characterisation

“…[10][11][12] The heterocycles as core units in thermotropic liquid crystals impart lateral and/or longitudinal dipoles combined with changes in the molecular shape. [13][14][15][16] Incorporation of heteroatoms results in considerable changes in the corresponding LC and physical properties, due to the fact that most of the heteroatoms (S, O and N) are more polarisable than carbon. [17] Pyrazoles are normally prepared via diacetylenesand transition metal-mediated cyclisation methods using eco-friendly, easy, environmentally green procedures.…”

Novel directed synthesis of functionalized pyrazole derivatives via regioselective solvent-free thiylation of 3-alkenylpyrazoles with arenethiols

“…19 Pyrazoles are used in supramolecular 20 and polymer chemistry, 21 in the food industry, as cosmetic colorings 22 and UV stabilizers 23 and some possess liquid crystal properties. 24,25 They are also applied in the design of complexes with unusual magnetic properties. 26,27 In the search for novel pyazoles as building blocks for the synthesis of biologically active and technologically useful substances, [1][2][3][4][5][6] the development of new methods for the preparation of functionalized pyrazoles and the synthesis of new pyrazole derivatives present an urgent challenge.…”