Synthesis and investigation of triphenylene discotic derivatives with donor and acceptor groups and with predictable type of mesomorphism
摘要:
Prognosis of columnar mesomorphism is performed, five new hexa- and hepta-substituted triphenylene derivatives with donor and acceptor groups are synthesized and their mesomorphoc properties are stusied. Good agreement is achieved between predictions and experiments. The synthesized triphenylene derivatives are found to display enantiotropic columnar mesomorphism. 1-Amino-2,3,6,7,10,11-hexaheptyloxytriphenylene anilides of 2,3,5-triiodo-, 3,4,5-trihydroxy- and 4-nitro-benzoic acids reveal enantiotropic dimesomorphism. Also found decrease in thermal stability and extension of the interval of existence of mesophase at introduction to triphenylene frame of substituents with acceptor groups at the amino group.
Ring-closure reactions. 21. Intramolecular .beta.-elimination competing with ring formation from o-(.omega.-bromoalkoxy)phenoxides over a wide range of ring sizes
Discotic Liquid Crystalline Poly(propylene imine) Dendrimers Based on Triphenylene
作者:Mark D. McKenna、Joaquín Barberá、Mercedes Marcos、José Luis Serrano
DOI:10.1021/ja0455906
日期:2005.1.1
The design, synthesis, and mesomorphic properties of a new series of homodendrimers consisting of the commercially available poly(propylene imine) (PPI) dendrimers (G = 1-5), PPI-(NH2)(n)(n = 4 8. 16, 32, 64), functionalized with a discotic triphenylene moiety are reported. The liquid crystalline behavior was investigated by means of differential scanning calorimetry (DSC), polarizing-light optical microscopy (POM), and X-ray diffractometry (XRD). All of the homodendrimers showed mesomorphic properties, with the second to fifth generations giving a hexagonal columnar mesophase (Col(h)) and the first generation a rectangular columnar mesophase (Col(r)). The X-ray study reveals that these mesophases show a highly ordered structure with segregation of triphenylenes and dendrimers into separate columns and a regular stacking distance inside the triphenylene columns. GPC analysis showed that the dendrimers had good monodispersity and MALDI-TOF studies of the first three generations gave good evidence that all of the terminal amino groups of the dendrimers were functionalized with a discotic unit.
The anodic trimerization of aromatic orthodiethers: new developments
作者:Jean-Marc Chapuzet、Jacques Simonet
DOI:10.1016/s0040-4020(01)87068-x
日期:1991.1
While the anodic trimerization of veratrole (leading to hexamethoxytriphenylene) is now a very well known reaction, developments concerning either mixed electrolysis (mixture of two orthodiethers) and/or oxidation of dissymmetrical substrates have not been conducted so far. The presented method, often specific, allows the synthesis of a new palette of liquid crystal precursors.
CORT, A. D.;MANDOLINI, L.;MASCI, B., J. ORG. CHEM., 1983, 48, N 22, 3979-3982
作者:CORT, A. D.、MANDOLINI, L.、MASCI, B.
DOI:——
日期:——
Ring-closure reactions. 21. Intramolecular .beta.-elimination competing with ring formation from o-(.omega.-bromoalkoxy)phenoxides over a wide range of ring sizes
作者:Antonella Dalla Cort、Luigi Mandolini、Bernardo Masci
DOI:10.1021/jo00170a020
日期:1983.11
Synthesis and investigation of triphenylene discotic derivatives with donor and acceptor groups and with predictable type of mesomorphism
作者:O. B. Akopova、E. V. Kurbatova、M. S. Gruzdev
DOI:10.1134/s1070363208100149
日期:2008.10
Prognosis of columnar mesomorphism is performed, five new hexa- and hepta-substituted triphenylene derivatives with donor and acceptor groups are synthesized and their mesomorphoc properties are stusied. Good agreement is achieved between predictions and experiments. The synthesized triphenylene derivatives are found to display enantiotropic columnar mesomorphism. 1-Amino-2,3,6,7,10,11-hexaheptyloxytriphenylene anilides of 2,3,5-triiodo-, 3,4,5-trihydroxy- and 4-nitro-benzoic acids reveal enantiotropic dimesomorphism. Also found decrease in thermal stability and extension of the interval of existence of mesophase at introduction to triphenylene frame of substituents with acceptor groups at the amino group.