- Meso-substituted boron-dipyrromethene compounds: synthesis, tunable solid-state emission, and application in blue-driven LEDs
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In this work, we depict the synthesis and characterization of a series of meso-substituted boron-dipyrromethene (BODIPY) compounds. Their optical and electrochemical properties were investigated systematically. All these compounds exhibited intense absorption bands in the ultraviolet (UV) and visible regions, which arise from the π–π* transitions based on their BODIPY core segments. By comparing electron-withdrawing substituents and electron-donating substituents, we found that these compounds exhibited some similar photophysical properties but exhibited different fluorescence in the solid state. All compounds were highly emissive in dichloromethane at room temperature (λem = 512–523 nm, ΦPL > 0.9). When these compounds were applied in blue-driven light-emitting diodes (LEDs) as light-emitting materials, the devices showed luminescence efficiency ranging from 1.09 to 34.13 lm/W. Their luminescence and electrochemical properties could be used for understanding the structure–property relationship of BODIPY compounds and developing functional fluorescent materials.
- Liu, Hao,Su, Huan,Chen, Zhiyuan,Zhu, Senqiang,Liu, Rui,Zhu, Hongjun
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- Preparation method of 3, 5-difluorophenol
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The invention provides a 3, 5-difluorophenol preparation method, which comprises the steps of S1, dissolving 3, 5-difluorobromobenzene in an organic solvent under inert gas protection, adding a bromine pulling agent to carry out a bromine pulling reaction, adding boric acid, filtering, and drying under reduced pressure to obtain 3, 5-difluorophenylboronic acid, and S2, dissolving the 3, 5-difluorophenylboronic acid, and adding an oxidizing agent and a catalyst to obtain the 3, 5-difluorophenol. The 3, 5-difluorophenol preparation method provided by the invention has the advantages of short steps and high yield, and is suitable for industrial production.
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Paragraph 0029; 0034-0048
(2021/05/12)
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- COMPOUND HAVING 2-FLUOROPHENYLOXYMETHANE STRUCTURE
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The present invention relates to a compound having a 2-fluorophenyloxymethane structure and useful for organic electronic materials and medical and agricultural chemicals, particularly materials for liquid crystal display elements. A problem to be solved
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Paragraph 0094
(2014/09/30)
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- Scope of the palladium-catalyzed aryl borylation utilizing bis-boronic acid
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The Suzuki-Miyaura reaction has become one of the more useful tools for synthetic organic chemists. Until recently, there did not exist a direct way to make the most important component in the coupling reaction, namely the boronic acid. Current methods to make boronic acids often employ harsh or wasteful reagents to prepare boronic acid derivatives and require additional steps to afford the desired boronic acid. The scope of the previously reported palladium-catalyzed, direct boronic acid synthesis is unveiled, which includes a wide array of synthetically useful aryl electrophiles. It makes use of the newly available second generation Buchwald XPhos preformed palladium catalyst and bis-boronic acid. For ease of isolation and to preserve the often sensitive C-B bond, all boronic acids were readily converted to their more stable trifluoroborate counterparts.
- Molander, Gary A.,Trice, Sarah L. J.,Kennedy, Steven M.,Dreher, Spencer D.,Tudge, Matthew T.
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supporting information; experimental part
p. 11667 - 11673
(2012/09/05)
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- LIQUID CRYSTALLINE COMPOUND, LIQUID CRYSTAL COMPOSITION, LIQUID CRYSTAL DISPLAY ELEMENT
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The invention provides a liquid crystal compound which has stability to heat, light and so forth, shows liquid crystal phases in a wide temperature range, and has a small viscosity, an appropriate optical anisotropy, a large dielectric anisotropy, and an
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Page/Page column 43-44
(2009/12/07)
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- Antipsychotic cyclic N-aralkylamines
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The invention relates to benzene derivatives, to pharmaceutical compositions containing them, to processes for preparing them, and to the method of use thereof in the treatment of psychotic disorders.
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- (Fluoroorgano)fluoroboranes and -fluoroborates I: Synthesis and spectroscopic characterization of potassium fluoroaryltrifluoroborates and fluoroaryldifluoroboranes
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A convenient preparation of K[ArBF3] (Ar=2-C6H4F, 3-C6H4F, 4-C6H4F, 2,6-C6H3F2, 3,5-C6H3F2, 2,4,6-C6H2F3, 3,4,5-C6H2F3, 2,3,4,5-C6HF4 and C6F5) is offered and the IR and multinuclear NMR spectra of these salts are reported. Treatment of the trifluoroborate salts with BF3 in chlorocarbon solvents provides an easy synthetic route to the corresponding aryldifluoroboranes ArBF2. The multinuclear NMR spectra of ArBF2 are presented. The electron substituent effect of the [-BF3]--group shows this substituent as one of the strongest σ-electron donors, while its π-electron influence is negligible (σI=-0.32, σR=-0.07).
- Frohn,Franke,Fritzen,Bardin
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p. 127 - 135
(2007/10/03)
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- Efficient syntheses of 2-(3',5'-difluorophenyl)-3-(4'- methylsulfonylphenyl)-cyclopent-2-enone, a potent COX-2 inhibitor
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2-(3',5'-Difluorophenyl)-3-(4'-methylsulfonylphenyl)cyclopent-2-enone (1) displays high selectivity and potency against COX-2. Three efficient syntheses of this diarylcyclopentenone are described. The first approach employs a Suzuki coupling reaction as the key step while the second synthesis features an intramolecular Friedel-Crafts acylation. The third, and preferred route to this compound involves a sequential malonate alkylation and acylation and ring-closure sequence.
- Zhao, Dalian,Feng, Xu,Chen, Cheng-yi,Tillyer, Rich D.,Grabowski, Edward J. J.,Reider, Paul J.,Black, Cameron,Quimet, Nathalie,Prasit, Peppi
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p. 6001 - 6018
(2007/10/03)
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- 2-(3,5-difluorophenyl)-3-(4-(methyl-sulfonyl)phenyl)-2-cyclopenten-1-one useful as an inhibitor of cyclooxygenase-2
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The invention encompasses the novel compound A, 2-(3,5-difluorophenyl)-3-(4-(methylsulfonyl)phenyl)-2-cyclopenten-1-one, pharmaceutical compositions and use of the compound in the preparation of medicaments for the treatment of cyclooxygenase-2 mediated diseases.
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- Insecticidal 5-substituted-2,4-diaminopyrimidine derivatives
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An insecticidal composition comprising, in admixture with an agriculturally acceptable carrier, an insecticidally effective amount of a compound of the formula: STR1 wherein R, R1, R2, R3, R7, R8, m, n, and p are as defined herein, and agriculturally acceptable salts thereof, and methods of using the same.
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