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The synthesis and transition temperatures of 5-(4-alkyl- and 4-alkoxy-phenyl)-2-cyanobenzo [b] furans and a 5-(4 '-alkylbiphenyl-4-yl)-2-cyanobenzo [b] furan: a comparison with their biphenyl and terphenyl analogues

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JournalLIQUID CRYSTALS
DatePublished - Jun 2001
Issue number6
Volume28
Number of pages12
Pages (from-to)901-912
Original languageEnglish

Abstract

The synthesis and transition temperatures of a series of 5-(4-alkyl- and 4-alkoxy-phenyl)-cyanobenzo[b]furans and a 5-(4'-alkylbiphenyl-4-yl)-2-cyanobenzo [b]furan are presented. The 2-cyanobenzo[b]furans show similar mesophase types to the analogous biphenyl and terphenyl compounds, which are obtained by replacing the benzo[b]furan unit with a phenyl ring. The transition temperatures for the 2-cyanobenzo[b]furan compounds are always higher than for their biphenyl and terphenyl counterparts, but they are much lower than for the corresponding phenylnaphthalenes. Five mesogenic benzo[b]furans without a cyano group were prepared as intermediates and these compounds have lower clearing points than their biphenyl analogues.

    Research areas

  • CROSS-COUPLING REACTIONS, NEMATIC LIQUID-CRYSTALS, FAMILY

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