Synthesis, Characterization, and Thermotropic Properties of Liquid Crystals with an Oligo (Ethylene Oxide) Monomethyl Substituent I: Biphenyl-Based Systems
摘要:
AbstractNew alkene liquid crystals 4‐[oligo(ethylene oxide)o, monomethylether)carbonyl]phenyl 4‐[4(allyloxy) phenyl]benzoate(MBPBEn, n = 1‐3), 4′‐[oligo(ethylene oxide)o, monomethylether)carbonyl]biphenyl‐4‐yl 4‐[4‐(al1yloxy)phenyl]benzoate(MBPBPEn, n = 1‐3), (S)‐4‐[(2‐methyl‐I‐butoxy)carbonyl]phenyl 4[4‐(allyloxy)phenyl]benzoate(MBPBKA), and (S)‐4′‐[(2‐methyl‐l‐butoxy)carbonyl]biphenyl‐4‐yl 4‐[4(allyloxy)phenyl]benzoate(MBPBPKA) were synthesized and characterized using 1H‐NMR and elemental analysis methods. The thermal transition temperatures, mesomorphic properties, and mesophase textures of these compounds have been determined by differential scanning calorimetry (DSC), by polarizing optical microscopy, and by X‐ray diffraction analysis. The effect of changes in chemical structure on the mesophase properties, mesophase and isotropic transition temperatures, and mesophase textures are discussed.
Synthesis, Characterization, and Thermotropic Properties of Liquid Crystals with an Oligo (Ethylene Oxide) Monomethyl Substituent I: Biphenyl-Based Systems
作者:Guo-Ping Chang-Chien
DOI:10.1002/jccs.199600059
日期:1996.10
AbstractNew alkene liquid crystals 4‐[oligo(ethylene oxide)o, monomethylether)carbonyl]phenyl 4‐[4(allyloxy) phenyl]benzoate(MBPBEn, n = 1‐3), 4′‐[oligo(ethylene oxide)o, monomethylether)carbonyl]biphenyl‐4‐yl 4‐[4‐(al1yloxy)phenyl]benzoate(MBPBPEn, n = 1‐3), (S)‐4‐[(2‐methyl‐I‐butoxy)carbonyl]phenyl 4[4‐(allyloxy)phenyl]benzoate(MBPBKA), and (S)‐4′‐[(2‐methyl‐l‐butoxy)carbonyl]biphenyl‐4‐yl 4‐[4(allyloxy)phenyl]benzoate(MBPBPKA) were synthesized and characterized using 1H‐NMR and elemental analysis methods. The thermal transition temperatures, mesomorphic properties, and mesophase textures of these compounds have been determined by differential scanning calorimetry (DSC), by polarizing optical microscopy, and by X‐ray diffraction analysis. The effect of changes in chemical structure on the mesophase properties, mesophase and isotropic transition temperatures, and mesophase textures are discussed.
One-Pot formation of novel [3+3] NH-CH2 bridged cyclophanes
The new [3+3] NH-CH2 bridged cyclophanes bearing different functional groups and different cavity sizes were prepared in one pot by treating diamine derivatives with dialdehyde derivatives. Factors important for efficiently form-ing these macrocycles include reaction concentration (10 or 100 mmol), temperature (room temperature or 40–50 °C) and solvent (CHCl3). Preliminary fluorescence spectrometer