173392-87-5Relevant academic research and scientific papers
Suzuki-Miyaura reaction of chloroarenes using Pd(PPh3) 4 as catalyst
Thiemann, Thies,Tanaka, Yasuko,Hisaindee, Soleiman,Kaabi, Maitha
experimental part, p. 34 - 38 (2010/06/16)
The reactivity of a number of chloroarenes was investigated and chloro-nitroarenes were found to undergo facile arylation with Pd(PPh 3)4 / [Pd(PPh3)2Cl 2/n.PPh3] as catalyst. Furthermore, 4-chlorobenzaldehyde underwent arylation under the conditions, albeit with a higher catalyst loading.
Toward boronate ester mesogenic structures
Belloni, Maura,Manickam,Wang, Zehn-He,Preece, Jon A.
, p. 93 - 114 (2007/10/03)
This article describes efforts toward the development of a new core for calamitic mesogens based upon the introduction of an extended heteroaromatic boroncontaining ring. A series of tri-catenar mesogenic boronate ester derivatives of the 2-phenyl-1,3,2-benzodioxaborole has been synthesized and characterized. The flat central core appeared to be a suitable feature for these derivatives to support anisotropic alignment. Additionally, these derivatives should possess an inherent dipole in the core. However, thermal analysis (polarized optical microscopy and differential scanning calorimetry) did not reveal any mesophases.
Highly efficient syntheses of 3-aryl-2-cycloalken-1-ones and an evaluation of their liquid crystalline properties
Marson,Farrand,Brettle,Dunmur
, p. 4377 - 4381 (2007/10/03)
Cycloalkenones are shown to be mesogens and can be synthesised in near quantitative yields by a convergent palladium(0)-catalysed cross-coupling strategy; a 2-methyl group induces a change of phase from smectic to nematic.
Synthesis and Properties of Liquid Crystalline 4,4 -Dialkoxy-2'-Methyl-p-Terphenyls
Yu, Z. N.,Tu, H. L.,Wan, X. H.,Chen, X. F.,Zhou, Q. F.
, p. 41 - 56 (2007/10/03)
A new series of laterally substituted terphenyl compounds, 4,4 -dialkoxy-2'-methyl-p-terphenyls (n = 1-12), were synthesized. Their liquid crystallinities were characterized by means of polarizing optical microscopy (POM), differential scanning calorimetry (DSC), and X-ray difraction (XRD). The influence of the length of the terminal alkoxy groups on the liquid crystalline behavior was investigated. It was found that the compounds with shorter end chains (n a smectic A mesophase is exhibited for those with longer end chains (9 = n = 12).
The X-ray crystal structures and computational analysis of NH...π hydrogen bonded banana-shaped carbazole derivatives and thermal analysis of higher mesogenic homologues
Belloni, Maura,Manickam,Ashton, Peter R.,Kariuki, Benson M.,Preece, Jon A.,Spencer, Neil,Wilkie, John
, p. 17 - 35 (2007/10/03)
The synthesis of a series of banana-shaped mesogenic structures has been carried out, in which the bend unit is formed by the 3,6-substitution of carbazole by 4-alkoxyphenyl moieties. The crystal structures of the methoxy and propyloxy derivatives are reported with an analysis of the N-H...π interactions that are observed in the crystalline state. This analysis was aided by semi-empirical molecular orbital calculations. Additionally, the thermal analysis of the complete series has been carried out in order to investigate the phase properties of these materials. The 4-nonyloxyphenyl derivative displays two melting points by DSC and normal light microscopy, but yields non-birefringent liquids. The incorporation of photorefractive molecular units, such as carbazole. into anisotropic materials may offer many advantages over conventional electrical poling of photorefractive polymers.
Synthesis and physical properties of thioester liquid crystals that exhibit an anti-ferro-anti phase sequencing
Nassif, Larissa,Jakli, Antal,Seed, Alexander J.
, p. 171 - 179 (2007/10/03)
The thioester unit has been commonly used to enhance the mesophase thermal stability and phase range in numerous liquid crystal materials. In this paper we report the synthesis of a homologous series of thioesters with similar structures to AS620 {(S)-(+)
Chiral cyclohexyl compounds
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, (2008/06/13)
The present invention describes liquid crystal compounds which are suitable for use in liquid crystal devices including those which exploit the electroclinic effect.
