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Triphenylene discotic liquid crystal trimers synthesized by Co(2)(CO)(8)-catalyzed terminal alkyne [2 + 2 + 2] cycloaddition
The synthesis of star-shaped discotic liquid crystal trimers using Co(2)(CO)(8)-catalyzed terminal alkyne [2 + 2 + 2] cycloaddition reaction is reported. The trimers consist of three triphenylene discotic units linked to a central 1,2,4-trisubstituted benzene ring via flexible spacers. The trimers w...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Beilstein-Institut
2013
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3869258/ https://www.ncbi.nlm.nih.gov/pubmed/24367450 http://dx.doi.org/10.3762/bjoc.9.321 |
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author | Han, Bin Hu, Ping Wang, Bi-Qin Redshaw, Carl Zhao, Ke-Qing |
author_facet | Han, Bin Hu, Ping Wang, Bi-Qin Redshaw, Carl Zhao, Ke-Qing |
author_sort | Han, Bin |
collection | PubMed |
description | The synthesis of star-shaped discotic liquid crystal trimers using Co(2)(CO)(8)-catalyzed terminal alkyne [2 + 2 + 2] cycloaddition reaction is reported. The trimers consist of three triphenylene discotic units linked to a central 1,2,4-trisubstituted benzene ring via flexible spacers. The trimers were synthesized in the yields up to 70% by mixing the monomers with 10 mol % of Co(2)(CO)(8) as the catalyst in refluxing 1,4-dioxane. The liquid crystalline properties were investigated by using polarizing optical microscopy (POM), differential scanning calorimetry (DSC) and X-ray diffraction (XRD). Trimer 4 with an ester connecting group and a longer spacer exhibited a rectangular columnar mesophase, while 5b and 5c possessing an ether linkage and a shorter spacer display a hexagonal columnar mesophase. The connecting functional group and the length of the flexible spacer between the central benzene ring and the triphenylene units have pivotal influence on the mesomorphism. |
format | Online Article Text |
id | pubmed-3869258 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2013 |
publisher | Beilstein-Institut |
record_format | MEDLINE/PubMed |
spelling | pubmed-38692582013-12-23 Triphenylene discotic liquid crystal trimers synthesized by Co(2)(CO)(8)-catalyzed terminal alkyne [2 + 2 + 2] cycloaddition Han, Bin Hu, Ping Wang, Bi-Qin Redshaw, Carl Zhao, Ke-Qing Beilstein J Org Chem Full Research Paper The synthesis of star-shaped discotic liquid crystal trimers using Co(2)(CO)(8)-catalyzed terminal alkyne [2 + 2 + 2] cycloaddition reaction is reported. The trimers consist of three triphenylene discotic units linked to a central 1,2,4-trisubstituted benzene ring via flexible spacers. The trimers were synthesized in the yields up to 70% by mixing the monomers with 10 mol % of Co(2)(CO)(8) as the catalyst in refluxing 1,4-dioxane. The liquid crystalline properties were investigated by using polarizing optical microscopy (POM), differential scanning calorimetry (DSC) and X-ray diffraction (XRD). Trimer 4 with an ester connecting group and a longer spacer exhibited a rectangular columnar mesophase, while 5b and 5c possessing an ether linkage and a shorter spacer display a hexagonal columnar mesophase. The connecting functional group and the length of the flexible spacer between the central benzene ring and the triphenylene units have pivotal influence on the mesomorphism. Beilstein-Institut 2013-12-11 /pmc/articles/PMC3869258/ /pubmed/24367450 http://dx.doi.org/10.3762/bjoc.9.321 Text en Copyright © 2013, Han et al. https://creativecommons.org/licenses/by/2.0https://www.beilstein-journals.org/bjoc/termsThis is an Open Access article under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The license is subject to the Beilstein Journal of Organic Chemistry terms and conditions: (https://www.beilstein-journals.org/bjoc/terms) |
spellingShingle | Full Research Paper Han, Bin Hu, Ping Wang, Bi-Qin Redshaw, Carl Zhao, Ke-Qing Triphenylene discotic liquid crystal trimers synthesized by Co(2)(CO)(8)-catalyzed terminal alkyne [2 + 2 + 2] cycloaddition |
title | Triphenylene discotic liquid crystal trimers synthesized by Co(2)(CO)(8)-catalyzed terminal alkyne [2 + 2 + 2] cycloaddition |
title_full | Triphenylene discotic liquid crystal trimers synthesized by Co(2)(CO)(8)-catalyzed terminal alkyne [2 + 2 + 2] cycloaddition |
title_fullStr | Triphenylene discotic liquid crystal trimers synthesized by Co(2)(CO)(8)-catalyzed terminal alkyne [2 + 2 + 2] cycloaddition |
title_full_unstemmed | Triphenylene discotic liquid crystal trimers synthesized by Co(2)(CO)(8)-catalyzed terminal alkyne [2 + 2 + 2] cycloaddition |
title_short | Triphenylene discotic liquid crystal trimers synthesized by Co(2)(CO)(8)-catalyzed terminal alkyne [2 + 2 + 2] cycloaddition |
title_sort | triphenylene discotic liquid crystal trimers synthesized by co(2)(co)(8)-catalyzed terminal alkyne [2 + 2 + 2] cycloaddition |
topic | Full Research Paper |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3869258/ https://www.ncbi.nlm.nih.gov/pubmed/24367450 http://dx.doi.org/10.3762/bjoc.9.321 |
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