79887-09-5Relevant articles and documents
BF3·OEt2-Promoted Propargyl Alcohol Rearrangement/[1,5]-Hydride Transfer/Cyclization Cascade Affording Tetrahydroquinolines
Zhao, Shuang,Wang, Xiaoyang,Wang, Pengfei,Wang, Guangwei,Zhao, Wentao,Tang, Xiangyang,Guo, Minjie
supporting information, p. 3990 - 3993 (2019/06/14)
An efficient BF3·OEt2-mediated propargyl alcohol rearrangement/[1,5]-hydride transfer/cyclization cascade for the synthesis of tetrahydroquinoline derivatives has been described. The substituents adjacent to triple bonds play an important role in the formation of ketones (via [1,3]-hydroxyl shift) or alkenyl fluorides which are products of formal trans-carbofluorination of internal alkynes. This method provides a rapid access to diverse heterocycles in moderate to excellent yields.
Reaction Selectivity in On-Surface Chemistry by Surface Coverage Control—Alkyne Dimerization versus Alkyne Trimerization
Klaasen, Henning,Liu, Lacheng,Meng, Xiangzhi,Held, Philipp Alexander,Gao, Hong-Ying,Barton, Dennis,Mück-Lichtenfeld, Christian,Neugebauer, Johannes,Fuchs, Harald,Studer, Armido
supporting information, p. 15303 - 15308 (2018/09/25)
This work reports the influence of molecular coverage in on-surface C?C-bond formation on reaction outcome. 6-Ethynyl-2-naphthoic acid (ENA) was chosen as organic component and Ag(111) as substrate. The alkyne moiety in ENA can either react by dimerizatio
Synthesis of substituted helicenes by Ir-catalyzed annulative coupling of biarylcarboxylic acid chlorides with alkynes
Kamikawa, Ken,Den, Hiroakira,Tsurusaki, Akihiro,Nagata, Tomoya,Miura, Masahiro
, p. 1069 - 1074 (2018/07/29)
A series of substituted [4] and [5]helicenes were synthesized in moderate to good yields by an Ir-catalyzed annulative coupling of biarylcarboxylic acid chlorides with internal alkynes, which involves facile C-H bond cleavage and decarbonylation. The double annulative coupling of 1, 1′:5′, 1″-ternaphthalene- 2, 2″-dicarboxylic acid dichloride with 4-octyne was also accomplished to give rise to an S-shaped double helicene. Unexpectedly, a π-extended benzofluoranthene-merged [5]- helicene was constructed through the annulative coupling and the successive C(aryl)-C(aryl) bond forming reaction when 1, 1′:4′, 1″-ternaphthalene-2, 2″-dicarboxylic acid dichloride was employed as the substrate. The crystal structure and the optical properties of the latter unique product were also investigated.
Synthesis and characterization of the multi-photon absorption and excited-state properties of a neat liquid 4-propyl 4′-butyl diphenyl acetylene
Khoo, Iam Choon,Webster, Scott,Kubo, Shoichi,Youngblood, W. Justin,Liou, Justin D.,Mallouk, Thomas E.,Lin, Ping,Hagan, David J.,Van Stryland, Eric W.
experimental part, p. 7525 - 7531 (2011/10/02)
The synthesis, characterization, and quantitative electronic structure modeling of multi-photon absorption properties of a neat liquid L34 (4-propyl 4′-butyl diphenyl acetylene) are reported. The liquid is (linearly) transparent in the visible spectrum, b
High birefringence phenylacetylene liquid crystals with low viscosity
Sekine, Chizu,Fujisawa, Koichi,Iwakura, Kazunori,Minai, Masayoshi
, p. 711 - 718 (2007/10/03)
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
Tolane derivatives, liquid crystal compositions containing the derivatives and liquid crystal display devices using the compositions
-
, (2008/06/13)
A tolane derivative, a liquid crystal composition containing the derivative, and a liquid crystal display device including the composition, in which the tolane derivative is represented by the following general formula: STR1 wherein R represents a straigh
Synthesis and Physical Properties of Asymmetric Diphenyldiacetylenic Liquid Crystals
Meng, H.-H. B.,Dalton, L. R.,Wu, S.-T.
, p. 303 - 314 (2007/10/02)
Fifty-six asymmetric diphenyl-diacetylene liquid crystal homologs including dialkyl, alkyl-alkoxy, cyano-alkyl, chloro-alkyl, fluoro-alkyl, difluoro-alkyl, lateral chloro-substituted fluoro-alkyl (or alkoxy), lateral fluoro-substituted asymmetric dialkyl, and vinyl-alkyl are synthesized and their physical properties evaluated.Among these asymmetric diphenyl-diacetylene liquid crystals, many dialkyl homologs exhibit low melting point, wide nematic range, and low heat of fusion.They are ideal host candidates for formulating eutectic mixtures.The polar groups make important contributions to the phase transition temperature, dielectric anisotropy, refractive indices and viscosity.Detailed effects depend on the position of the substitution.These new liquid-crystals compounds and mixtures are particularly useful for electro-optic modulation of infrared radiation. - Keywords: Diphenyl-diacetylenes, eutectic mixtures, electro-optic modulation, physical properties
Thienotriazolodiazepines as platelet-activating factor antagonists. Steric limitations for the substituent in position 2
Walser,Flynn,Mason,Crowley,Maresca,O'Donnell
, p. 1440 - 1446 (2007/10/02)
The preparations of thienotriazolodiazepines bearing a substituted ethynyl group at the 2-position, and the corresponding cis-olefins and fully saturated analogues are described. The compounds were evaluated as potential antagonists of platelet-activating