125151-58-8Relevant academic research and scientific papers
Buchwald protocol applied to the synthesis of N-heterotolan liquid crystals
Vasconcelos, Ursula B.,Schrader, Abel,Vilela, Guilherme D.,Borges, Antonio C.A.,Merlo, Aloir A.
, p. 4619 - 4626 (2008/09/20)
A homologous series of the new N-heterotolans 8a-d were synthesized using two cross-coupling reactions mediated by copper and palladium/copper. The final compounds present the phenyl-pyridyl framework connected by the acetylene group. The evaluation of th
Synthesis and mesomorphic properties of some fluorinated benzoate liquid crystals
Yang, Yong Gang,Chen,Tang,Wen
, p. 1 - 15 (2007/10/03)
Three series of [4-(4′-n-alkyloxyphenyl)acetylenyl]-2,6- difluorophenyl fluorinated benezoates and one series of fluorinated benzoates with 2,3,5,6-tetrafluorophenylene group and semi-perfluorocarbon chain have been synthesized. Their phase transition temperatures have been measured by texture observation in a polarizing microscope and confirmed by DSC. For the series without fluorocarbon chains, increasing the quantity of fluorosubstituents on the terminal phenyl groups decreased nematic stability (TN-I), but the breadth of the SmA phase range was increased. Lateral fluorosubstitution in the central group lowered the nematic stability (TN-I) and decreased the breadth of the SmA phase range. The series with semiperfluorocarbon chains were more likely to form SmA phases than the series with hydrogencarbon chains, and with the increasing of fluorosubstituents quantity on the terminal phenyl groups nematic and SmA stability (TN-I and TsmA-N) were both decreased.
Synthesis and mesomorphic properties of some fluoro-substituted benzoates
Yang,Tang,Gong,Wen
, p. 153 - 165 (2007/10/03)
Several series of fluoro-substituted benzoate liquid crystals have been synthesized. The results showed that the SmA phase is enhanced with the increasing of the degree of fluoro-substitution on the para- and meta-position of the terminal phenyl groups. And the molecules which have same molecular structural formula show nearly the same melting points. It is also discussed about the effect of the ester bond's direction on the mesomorphic properties.
