01896nas a2200229   4500008004100000022001400041245008700055210006900142260006800211300001400279490000800293520106100301653002701362653002101389653001701410100002201427700002801449700003101477700001801508700001901526856012101545       2006                        eng d  a0021-899500aThermotropic behavior of lithocholic acid derivative linked hydroxyethyl cellulose0 aThermotropic behavior of lithocholic acid derivative linked hydr  a111 RIVER ST, HOBOKEN, NJ 07030 USAbJOHN WILEY & SONS INCcMAY  a1995-20010 v1003 a<p>Various mesogenic lithocholic acid (LA) derivatives [3-acetyl LA (LAAC); 3-propionyl LA (LAP), 3-cinnamoyl LA (LACin); 3-benzoyl LA (LAB), 3-(4-nitrobenzoyl) LA (LANB); and methyl-3-(3-carboxypropionyl) LA, i.e., LA methyl ester monosuccinate (LAMeMS)] were reacted with hydroxyethyl cellulose (HEC) to obtain a series of LA derivatives of HEC. These polymers were characterized by the mesogen content, 1.1, differential scanning calorimetry, and hot-stage coupled polarizing optical microscopy. The degree Of Substitution (DS) ranged from 0.27 to 1.11. Polymers HEC-LAB (DS = 1.11), HEC-LANB (DS = 0.80), HEC-LACin (DS = 0.76), and HEC-LAP (DS = 0.27) exhibited a mesophase on heating whereas HEC-LAB also showed a mesophase on cooling. The other polymers HEC-LAAC (DS = 0.89) and HEC-LAMeMS (DS = 0.36) did not reveal mesophase formation with either heating or cooling. It is observed that the formation of a mesophase is affected by the type of mesogen that is used rather than the mesogen content of the polymer. (c) 2006 Wiley Periodicals, Inc.</p>10ahydroxyethyl cellulose10alithocholic acid10athermotropic1 aShaikh, V., A. E.1 aMaldar, Noormahamad, N.1 aLonikar, Shrikant, Vitthal1 aRajan, C., R.1 aPonrathnam, S.  uhttps://library.ncl.res.in/content/thermotropic-behavior-lithocholic-acid-derivative-linked-hydroxyethyl-cellulose-101727nas a2200181   4500008004100000022001400041245008800055210006900143260008400212300001400296490000700310520100500317100002901322700003101351700002401382700001801406856012101424       2007                        eng d  a0009-267300aCholesterol-linked beta-cyclodextrin - a thermotropic liquid-crystalline derivative0 aCholesterollinked betacyclodextrin a thermotropic liquidcrystall  a1-5 KANDA-SURUGADAI CHIYODA-KU, TOKYO, 101-8307, JAPANbCHEMICAL SOC JAPANcOCT  a1975-19800 v803 a<p>Liquid-crystalline derivative of ss-cyclodextrin (BCD) was prepared by covalent linking of monocholesteryl succinate (ChMS) with ss-cyclodextrin. To the best of our knowledge, this was first ever attempt so far of its kind, in which BCD has been converted into its liquid-crystalline derivative through covalent linkage of a mesogen. The degree of substitution (DS) obtained was approximate to 2.00. The product was characterized by various techniques, such as FT-IR, NMR, DSC, hot-stage-coupled optical polarizing microscopy (OPM), microanalysis and chemical methods. Cholesterol-linked ss-cyclodextrin (CDCh) derivative was found to exhibit thermotropic liquid-crystalline behavior. The product exhibited birefringence during first heating above 130 degrees C, and it became isotropic at about 180 degrees C, whereas the parent compound BCD decomposed without melting above 250 degrees C. A comparison of CDCh derivative to similar liquid-crystalline polysaccharide derivatives is presented.</p>1 aShaikh, Vasi, Ahmed Ebra1 aLonikar, Shrikant, Vitthal1 aDhoble, Deepa, Arun1 aPawar, G., M.  uhttps://library.ncl.res.in/content/cholesterol-linked-beta-cyclodextrin-thermotropic-liquid-crystalline-derivative-0