Novel hexasubstituted triphenylene discotic liquid crystals having three different types of peripheral substituent

Kumar, Sandeep; Naidu, Jaishri J.

Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/5486

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DC Field	Value	Language
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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