Journal ArticleDOI
New Synthesis of the Liquid Crystalline Bicyclohexylbenzene Derivatives
Reads0
Chats0
TLDR
In this article, a new approach to prepare the liquid crystalline bicyclohexylbenzene derivatives is proposed, where the key stage is the synthesis of 3-(trans-4-arylcyclohexynyl)-6-alkyl (or aryl) cyclohex-2-en-1-ones via the condensation of the corresponding Mannich salts with 2-substituted acetoacetic esters (or methyl benzyl ketones) in the presence of a base.Abstract:
A new improved approach to prepare the liquid crystalline bicyclohexylbenzene derivatives is proposed. The key stage is the synthesis of 3-(trans-4-arylcyclohexyl)-6-alkyl (or aryl) cyclohex-2-en-1-ones via the condensation of the corresponding Mannich salts with 2-substituted acetoacetic esters (or methyl benzyl ketones) in the presence of a base. The catalytic hydrogenation of these cyclohexenones in base media gives mainly saturated trans-ketones which are promising semiproducts for the preparation of different kinds of the LC compounds containing a bicyclohexyl fragment. The chemical transformations of the prepared cyclohexanones were carried out and as a result a range of LC compounds both known and new ones were synthesized.read more
Citations
More filters
Journal ArticleDOI
3-Aryl- or 3-(trans-4-alkylcyclohexyl)- 6-arylcyclohex-2-enones: synthesis, transformations and mesomorphic properties
Vladimir Bezborodov,Genadz Sasnouski,V. Lapanik,Roman Dabrowski,Jerzy Dziaduszek,V. I. Tyvorskii +5 more
TL;DR: In this paper, the synthesis and chemical transformations of 3-aryl or 3-(trans-4-alkylcyclohexyl)- 6-aryl cyclohex-2-enones into liquid crystalline compounds are discussed.
Journal ArticleDOI
Phase transition and dielectric studies of a three-ring homologous series with the -ncs terminal group
TL;DR: In this article, the synthesis route and phase properties for a new three-ring homologous series, 4-(trans,trans-4-alkylbicyclohexyl)benzene-isothiocyanates (nCCHBT) with n=2-7, are presented.
Journal ArticleDOI
A New Pathway for the Synthesis of Liquid Crystalline Bicyclohexanes
TL;DR: In this article, a new synthetic approach for the preparation of liquid crystalline dicyclohexyl derivatives was proposed and realised, starting from ethyl trans-4-alkyl-cyclohexancarboxylates, the corresponding 6-(4,alkylcyclochenyl)-3,alkycyclo-hexanol-2-en-1-ones have been prepared.
Journal ArticleDOI
LC diketones: synthesis, transformations and mesomorphic properties
TL;DR: In this article, the synthesis and chemical transformations of various diketones into liquid crystalline compounds are discussed, including the interaction of cyclohexene with acid chlorides and benzene in the presence of aluminium chloride (Nenitzescu method).
Journal ArticleDOI
Multikilogram Scale Organolithiation Chemistry for the Manufacture of Liquid Crystal Intermediates
TL;DR: In this paper, the kilogram-scale regioselective synthesis of various fluorinated arylboronic acids, cyclohexenyl-substituted aryls in good to good quality was described.
References
More filters
Journal ArticleDOI
Fluorinated Liquid Crystals for Active Matrix Displays
TL;DR: In this article, eight types of two-and three-ring liquid-crystalline compounds each possessing a 3,4-difluorophenyl substituent were synthesized.
Journal ArticleDOI
Linear and non-linear liquid crystal materials, electro-optical effects and surface interactions. Their application in present and future devices
TL;DR: In this article, the structural, material and electro-optical properties of halogenated nematic liquid crystals are correlated, and a recently presented, efficient liquid crystal colour projection concept, whose functional elements, i.e. polarizers, filters and modulators, consist entirely of liquid crystal devices, is reviewed.
Journal ArticleDOI
Ultrasound in organic synthesis. 7. Preparation of organozinc reagents and their nickel-catalyzed reactions with .alpha.,.beta.-unsaturated carbonyl compounds
Journal ArticleDOI
Trifluorinated Liquid Crystals for TFT Displays
TL;DR: In this paper, a general formula for 3,4,5-tri-fluorobenzene derivatives with different core structures has been derived based on the interaction of impurity ions with the induced and permanent dipoles of the liquid crystal molecules.
Journal ArticleDOI
Synergisms, structure-material relations and display performance of novel fluorinated alkenyl liquid crystals
TL;DR: Several new classes of low polarity, low viscosity and optically weakly anisotropic two and three ring fluorinated liquid crystals with alkenyl side chains are presented in this paper.