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http://hdl.handle.net/2289/5486
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DC Field | Value | Language |
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dc.contributor.author | Kumar, Sandeep | - |
dc.contributor.author | Naidu, Jaishri J. | - |
dc.date.accessioned | 2013-03-21T11:54:35Z | - |
dc.date.available | 2013-03-21T11:54:35Z | - |
dc.date.issued | 2002-07 | - |
dc.identifier.citation | Liquid Crystals, 2002, Vol.29, p899 | en |
dc.identifier.issn | 0267-8292 | - |
dc.identifier.issn | 1366-5855(Online) | - |
dc.identifier.uri | http://hdl.handle.net/2289/5486 | - |
dc.description | Restricted Access. | en |
dc.description.abstract | The synthesis and mesomorphic properties of a variety of novel hexasubstituted triphenylene derivatives having three different types of peripheral substitutions are described. Monobromination of 2,3, 6, 7-tetrakis ( pentyloxy) triphenylene 4, prepared by Suzuki coupling of 2-iodo-3', 4,4',5-tetrakis (pentyloxy) biphenyl 2 and phenylboronic acid followed by cyclization, yields 10-bromo-2, 3, 6,7-tetrakis( pentyloxy) triphenylene 5. Nucleophilic aromatic displacement of the bromine with the potassium salt of pentanethiol, followed by bromination, yields 2-bromo-6,7,10,11-tetrakis(pentyloxy)-3-(pentylsulphanyl) triphenylene 7 having a bromo, thioalkyl and alkoxy-substituted periphery of the triphenylene nucleus. The reaction of 7 with copper( I) cyanide gives the cyanotriphenylene derivative 8, while palladium-copper catalysed alkynylation of 7 results in the synthesis of the substituted alkyne derivative 9. The deprotected alkyne 10 was converted to dimer 11 where two molecules of a monothioalkyl-tetra-alkoxytriphenylene are connected via a rigid pi-conjugated diacetylene bridge. Compounds 7, 8, 9, 10 form hexagonal columnar phases while the dimer 11 shows a discotic nematic phase. | en |
dc.language.iso | en | en |
dc.publisher | Taylor & Francis | en |
dc.relation.uri | http://dx.doi.org/10.1080/02678290210145148 | en |
dc.rights | 2002 Taylor & Francis | en |
dc.title | Novel hexasubstituted triphenylene discotic liquid crystals having three different types of peripheral substituent | en |
dc.type | Article | en |
Appears in Collections: | Research Papers (SCM) |
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File | Description | Size | Format | |
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2002_LC_Vol.29_p899.pdf Restricted Access | Restricted Access | 333.74 kB | Adobe PDF | View/Open Request a copy |
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