24951-77-7Relevant academic research and scientific papers
Synthesis of Novel Liquid Crystalline Polyesters of Cholesterol: Thermal, Electrical Conductivity and Dielectric Properties
Dutta, Priyanka,Saikia, Porimita,Hoque, Samiul,Nath Dass, Narendra,Sarma, Neelotpal Sen
, p. 112 - 122 (2015)
Novel liquid crystalline polyesters of cholesterol, Polycholesteryl-3,3-dimethylacrylate (PCHDMA) and Polycholesterylcrotonate (PCHC) are synthesized by free radical polymerization and characterized by FT-IR, 1H-NMR, and GPC analysis. The thermal properties are studied by TGA and DSC techniques. The liquid crystalline phases are detected under hot stage optical microscope. Electronic conduction in the polymers is determined by Wagner polarization technique. There is about 5000 fold decrease in the impedance values of both PCHDMA and PCHC on increasing the frequencies from 40 Hz to 1 MHz at 30°C. Amperometric analysis of the polymers are also carried out at different temperatures and frequencies.
1, 3-dichloro trifluoromethylbenzal manufacturing method
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, (2007/10/14)
Epichlorohydrin is produced from acetone by (1) chlorinating acetone to form monochloroacetone; (2) disproportionating the monochloroacetone in the presence of a platinum catalyst, a strong acid and preferably a chloride source (for example, added as a salt or from hydrolysis of monochloroacetone) and some water to produce acetone and 1,3-dichloroacetone; (3) hydrogenating the 1,3-dichloroacetone in the presence of a catalyst to produce 1,3-dichlorohydrin; and (4) cyclizing the 1,3-dichlorohydrin with a base to produce epichlorohydrin.
SYNTHESIS AND PROPERTIES OF LIQUID CRYSTALS. III. CHOLESTERYL ESTERS OF SOME CIS,TRANS-ISOMERIC UNSATURATED ACIDS
Bogat-skii, A. V.,Galantina, A. I.,Derkach, L. G.,Taubert D.
, p. 2072 - 2075 (2007/10/02)
A series of esters of cholesterol with the cis,trans isomers of unsaturated monocarboxylic acids were synthesized.The effect of the nature and of the configuration of the substituents in relation to the double bond in the acid component of the cholesterol esters on the mesogenic capacity was established.The phase transition temperatures were determined.
