- Highly ordered smectic structures of disc-rod luminescent liquid crystals: The role of the tolane group
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Two novel calamitic tolane luminogen-modified triphenylene-based discotic luminescent liquid-crystals (LLC) were rationally designed and synthesized to investigate the self-assembly competition between triphenylene discogens and tolane calamitic mesogens.
- Liu, Yurong,Li, Wei,Zhou, Xuan,Wong, Wai-Yeung,Yu, Zhen-Qiang
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supporting information
p. 3555 - 3561
(2021/03/26)
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- A concise synthesis of isoxazole-based side chain of Micafungin
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A concise synthesis of key isoxazole-based side chain of Micafungin, an USFDA approved anti-fungal agent, has been delineated. The route design notably involves a one pot regioselective isoxazole construction from the corresponding aryl aldehyde and alkyne intermediates.
- Rao, Pallavi,Hussain, Ismail,Rao, Venkataramanarao,Sen, Saikat,Oruganti, Srinivas
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supporting information
p. 2180 - 2187
(2019/06/25)
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- Cleavage of the Carbon–Carbon Triple Bonds of Arylacetylenes for the Synthesis of Arylnitriles without a Metal Catalyst
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Cleavage of the carbon–carbon triple bonds of alkynes was achieved, which led to the synthesis of arylnitriles under transition-metal-free conditions. A vast range of terminal alkyne substrates underwent this reaction to provide the corresponding nitriles in moderate to good yields with good functional group tolerance.
- Lin, Yuanguang,Song, Qiuling
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supporting information
p. 3056 - 3059
(2016/07/12)
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- Synthesis of some novel aromatic alkynyl silanes: Mesomorphic characterization of ethynyl-substituted rod-shaped molecules
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The synthesis and characterization of 10 new rod-shaped substituted benzoates possessing the 4-(2-trimethylsilyl)ethynyl group in terminal phenyl position is reported employing the simple and efficient Sonogashira cross-coupling and DCC esterification. 4′
- Srinivasa,Hariprasad
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- Aerobic oxynitration of alkynes with tBuONO and TEMPO
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An efficient method for stereoselective nitroaminoxylation of alkyne has been reported. The reaction enjoys a broad substrate scope, good functional group tolerance, and high yields. Synthetically useful α-nitroketones can be accessed through these products in a single step.
- Dutta, Uttam,Maity, Soham,Kancherla, Rajesh,Maiti, Debabrata
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supporting information
p. 6302 - 6305
(2015/02/19)
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- Synthesis of diphenyl-diacetylene-based nematic liquid crystals and their high birefringence properties
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We synthesized two series of diphenyl-diacetylene (DPDA)-based materials with alkoxy and alkyl tails of length m (DPDA-OCm and DPDA-Cm, respectively), and measured their nematic-phase birefringence (Δn) as a function of wavelength and temperature. We found that Δn decreases with an increase in m, possibly by a dilution effect of the low-Δn alkyl tail. Further, of the two series, Δn was found to be relatively higher in the DPDA-OCm materials, with the highest value of 0.4 obtained for DPDA-OC1 at 550 nm at 10 °C below the isotropic-to-nematic transition temperature. Further, we observed the temperature dependence for Δn, which is proportional to the order parameter (s). From extrapolation to s = 1 (the perfect orientation state), it is speculated that the DPDA-O moiety has the potential to afford a very large Δn of 0.9. The Royal Society of Chemistry 2012.
- Arakawa, Yuki,Nakajima, Shunpei,Ishige, Ryohei,Uchimura, Makoto,Kang, Sungmin,Konishi, Gen-Ichi,Watanabe, Junji
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supporting information; experimental part
p. 8394 - 8398
(2012/07/28)
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- High birefringence nematic liquid crystals for display and telecom applications
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Several compounds with high birefringence and, having tolane structure were synthesized. For a high polarizability, isothiocyanato (NCS) terminal group was introduced. Another goal of this study was reduction of melting point and smectic phases by introduction of fluorine as lateral substituent. The transition temperatures for all the synthesized compounds and the refractive and dielectric indices for one of the compounds have been determined. Electro-optic (EO) measurements were also performed.
- Catanescu, Carmen Otilia,Chien,Wu, Shin-Tson
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p. 93/[1135]-102/[1144]
(2007/10/03)
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- Ordering of apolar and polar solutes in nematic solvents
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To illustrate the relative importance of electrostatic interactions, the LC-NMR data for a pair of polar and apolar solutes that are structural isomers, ortho- and para-dichlorobenzene, respectively, dissolved in polar and apolar nematogens were analyzed.
- Dingemans,Photinos,Samulski,Terzis,Wutz
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p. 7046 - 7061
(2007/10/03)
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- Synthesis and mesomorphic properties of some fluorinated benzoate liquid crystals
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Three series of [4-(4′-n-alkyloxyphenyl)acetylenyl]-2,6- difluorophenyl fluorinated benezoates and one series of fluorinated benzoates with 2,3,5,6-tetrafluorophenylene group and semi-perfluorocarbon chain have been synthesized. Their phase transition temperatures have been measured by texture observation in a polarizing microscope and confirmed by DSC. For the series without fluorocarbon chains, increasing the quantity of fluorosubstituents on the terminal phenyl groups decreased nematic stability (TN-I), but the breadth of the SmA phase range was increased. Lateral fluorosubstitution in the central group lowered the nematic stability (TN-I) and decreased the breadth of the SmA phase range. The series with semiperfluorocarbon chains were more likely to form SmA phases than the series with hydrogencarbon chains, and with the increasing of fluorosubstituents quantity on the terminal phenyl groups nematic and SmA stability (TN-I and TsmA-N) were both decreased.
- Yang, Yong Gang,Chen,Tang,Wen
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- Solid dimorphism of tetra-arylcyclobutadienecobalt derivatives bearing long aliphatic lateral groups
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A new series of disk-like cyclobutadienecobalt derivatives symmetrically substituted by lateral alkoxy groups with different chain lengths (-O(CH2)nCH3, n=5, 6, 8, and 12) were prepared and their thermal phase transition b
- Yamanishi, Hiroko,Tomita, Ikuyoshi,Ohta, Kazuchika,Endo, Takeshi
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- High birefringence phenylacetylene liquid crystals with low viscosity
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We have synthesized new high Δ n 3-ring phenylacetylene(3PA) liquid crystals which have substituent groups with core center phenyl ring and investigated the effects of substitution on physical properties. Nematic range and viscosity were improved remarkab
- Sekine, Chizu,Fujisawa, Koichi,Iwakura, Kazunori,Minai, Masayoshi
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p. 711 - 718
(2007/10/03)
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- Synthesis and mesomorphic properties of some fluoro-substituted benzoates
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Several series of fluoro-substituted benzoate liquid crystals have been synthesized. The results showed that the SmA phase is enhanced with the increasing of the degree of fluoro-substitution on the para- and meta-position of the terminal phenyl groups. And the molecules which have same molecular structural formula show nearly the same melting points. It is also discussed about the effect of the ester bond's direction on the mesomorphic properties.
- Yang,Tang,Gong,Wen
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p. 153 - 165
(2007/10/03)
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