- UV LED photoinitiator and preparation method thereof
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The present invention discloses a UV LED photoinitiator and a preparation method thereof. The UV LED photoinitiator has a chemical structure represented by a formula (M) as shown in the specification,wherein X is a group shown in the specification, a grou
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Paragraph 0081-0087
(2020/12/31)
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- PHOTOSTABLE MIMICS OF MACULAR PIGMENT
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Described are visible light absorbing compounds. The compounds have a visible light absorption maximum between 430 and 480 nm and a full width half maximum (FWHM) at the visible light absorption maximum of at least 35 nm and up to 100 nanometers, wherein
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Page/Page column 46
(2021/01/23)
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- Pd-Catalyzed Cross-Coupling Reactions Promoted by Biaryl Phosphorinane Ligands
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We report the use of biaryl phosphorinanes as ligands for Pd-catalyzed cross-coupling reactions. A modular synthesis was developed that employs a double conjugate addition of primary biaryl phosphines into 1,1,5,5-tetraalkyl penta-1,4-diene-3-ones. Notably, this synthesis does not require the use of copper, a known contaminant in structurally related biaryl phosphane ligands. Using the synthetic strategy described above, we synthesized a library of biaryl phosphorinanes, varying their substitution about phosphorus and the steric and electronic nature of the biaryl motif. We then benchmarked their performance as ligands in Pd-catalyzed cross coupling reactions such as aryl sulfonamidation, aryl alkoxylation, and aryl amination in the presence of soluble organic bases. In each reaction studied, many ligands outperformed biaryl phosphanes known to promote the given transformation. Detailed substrate scopes were determined using high-throughput screening technology. Several biaryl phosphorinanes and their corresponding Pd(II) oxidative-addition complexes were extensively characterized using NMR spectroscopy and X-ray crystallography. General observations support that biaryl phosphorinanes promote reductive elimination and form robust catalysts with palladium. In many cases the use of these biaryl phosphorinanes may be advantageous over the use of biaryl phosphanes with respect to lower catalyst loadings, shorter reaction times, and robustness.
- Laffoon, Joshua D.,Chan, Vincent S.,Fickes, Michael G.,Kotecki, Brian,Ickes, Andrew R.,Henle, Jeremy,Napolitano, José G.,Franczyk, Thaddeus S.,Dunn, Travis B.,Barnes, David M.,Haight, Anthony R.,Henry, Rodger F.,Shekhar, Shashank
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p. 11691 - 11708
(2019/12/02)
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- Thioxanthone compound crystal having room temperature phosphorescent property and preparation method and use thereof
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The present invention relates to a thioxanthone compound crystal having a room temperature phosphorescent property and a structure represented by the following formula I and a preparation method and use thereof, wherein R is-Cl,-Br,-OCH3, or-OCH(CH3)2. The crystal can be used as a room temperature phosphorescent material for optoelectronic devices (including light-emitting devices, display and illumination systems, organic electroluminescent devices, and the like), photocatalytic reactions, optical storage (information storage), molecular sensing, anti-counterfeiting and biological imaging andother optoelectronic fields.
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Paragraph 0062; 0064
(2018/07/30)
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- POLYMERIC PHOTO ACTIVE AGENTS
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The present disclosure is drawn to polymeric photo active agents, photo curable inks containing the polymeric photo active agents, and methods of making the photo curable inks. A polymeric photo active agent can include a xanthone analog modified with a polyether chain connecting to the xanthone analog through an amide linkage.
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Paragraph 0075
(2018/02/01)
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- Synthesis of spirocyclic diarylfluorenes by one-pot twofold SNAr reactions of diaryl sulfones with diarylmethanes
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Treatment of dibenzothiophene dioxides with cyclic diarylmethanes in the presence of KN(SiMe3)2 results in the formation of fluorene-based spirocyclic tetraarylmethanes in a single operation. The transformation would proceed via an intermolecular SNAr reaction of the dioxides with cyclic diarylmethylpotassium followed by intramolecular SNAr cyclization. This straightforward strategy provides a wide range of spirocyclic diarylfluorenes including unusual ones that are otherwise difficult to synthesize.
- Bhanuchandra,Yorimitsu, Hideki,Osuka, Atsuhiro
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supporting information
p. 384 - 387
(2016/02/19)
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- Copper-Catalyzed Hydroxylation of (Hetero)aryl Halides under Mild Conditions
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The combination of Cu(acac)2 and N,N′-bis(4-hydroxyl-2,6-dimethylphenyl)oxalamide (BHMPO) provides a powerful catalytic system for hydroxylation of (hetero)aryl halides. A wide range of (hetero)aryl chlorides bearing either electron-donating or -withdrawing groups proceeded well at 130 °C, delivering the corresponding phenols and hydroxylated heteroarenes in good to excellent yields. When more reactive (hetero)aryl bromides and iodides were employed, the hydroxylation reactions completed at relatively low temperatures (80 and 60 °C, respectively) at low catalytic loadings (0.5 mol % Cu).
- Xia, Shanghua,Gan, Lu,Wang, Kailiang,Li, Zheng,Ma, Dawei
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supporting information
p. 13493 - 13496
(2016/10/31)
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- Palladium-catalyzed hydroxylation of aryl and heteroaryl halides enabled by the use of a palladacycle precatalyst
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A method for the hydroxylation of aryl and heteroaryl halides, promoted by a catalyst based on a biarylphosphine ligand tBuBrettPhos (L5) and its corresponding palladium precatalyst (1), is described. The reactions allow the cross-coupling of both potassium and cesium hydroxides with (hetero)aryl halides to afford a variety of phenols and hydroxylated heteroarenes in high to excellent yield.
- Cheung, Chi Wai,Buchwald, Stephen L.
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p. 5351 - 5358
(2014/06/23)
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- A green and regioselsctive synthesis of xanthone and thioxanthone derivatives in the presence of heteropoly acid under microwave irradiation
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One-pot preparation of a variety of pharmacologically pertinent xanthone heterocycles has efficiently been achieved from their respective phenol compounds and salicylic acid/thiosalicylic acid in the presence of the catalytic amount of heteropoly acid. Most of the reactions showed high regioselectivity and produced xanthones/thioxanthones in good yields under microwave irradiation.
- Nasseri, Mohammad A.,Alizadeh, Somayyeh,Zakerinasb, Batol,Beni, Alireza Salimi
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p. 338 - 344
(2014/05/20)
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- Radiation curable compositions
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A polymerizable Norrish Type II photoinitiator according to Formula (I): Radiation curable compositions and inkjet inks containing the polymerizable Norrish Type II photoinitiator of Formula (I) exhibit improved compatibility with and solubility in radiat
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Paragraph 0218; 0219; 0220
(2013/09/26)
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- RADIATION CURABLE COMPOSITIONS
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A polymerizable Norrish Type II photoinitiator according to Formula (I): . Radiation curable compositions and inkjet inks containing the polymerizable Norrish Type II photoinitiator of Formula (I) exhibit improved compatibility with and solubility in radi
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- POLYMERIZABLE PHOTOINITIATORS AND RADIATION CURABLE COMPOSITIONS
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A new type of polymerizable Norrish Type II photoinitiators having an optionally substituted benzophenone group or an optionally substituted thioxanthone group is disclosed exhibiting improved compatibility with and solubility in radiation curable compositions. Radiation curable compositions and inkjet inks containing these polymerizable Norrish Type Il photoinitiators, exhibiting low extractable amounts of the photoinitiators and their residues after curing, are also disclosed.
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Page/Page column 44
(2010/04/06)
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- NEW PHOTOINITIATORS
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The present invention is related to novel photoinitiators, in particular to photoinitiators comprising amino groups within the molecule.
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Page/Page column 22
(2010/11/17)
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- Preparation method of copolymerizable photoinitiators
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An intermediate for preparing (meth)acrylated photoinitiators according to Formula (I): wherein: R1 is selected from the group consisting of hydrogen and a methyl group; A represents a group comprising at least one photoinitiating moiety; L represents a n+o-valent linking group comprising at least one carbon atom; n and o each independently represent an integer from 1 to 4; p is equal to 0 or 1; X represents a group selected from the group consisting of Cl, Br, I and R2SO3; and R2 represents an optionally substituted group selected from the group consisting of an alkyl group, an alkenyl group, an alkynyl group, an alkaryl group , an aralkyl group, an aryl group and a heteroaryl group. A method for the preparation of (meth)acrylated photoinitiators by β-elimination of HX from the intermediate according to Formula (I) is also disclosed.
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Page/Page column 22-23
(2009/06/27)
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- A novel and efficient method for the synthesis of new hydroxythioxanthone derivatives
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We describe the synthesis of some new hydroxythioxanthones by treatment of thiosalicylic acid (TSA) with various substituted phenols in the presence of Al2O3-CH3SO3H (AMA). Most of the reactions show high regioselectivity and produce thioxanthones in good yields.
- Sharghi, Hashem,Beni, Ali Reza Salimi
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p. 2900 - 2904
(2007/10/03)
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- Water soluble thioxantone photoinitiators
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The invention provides novel thioxanthone photoinitiators having the formula: STR1 wherein R1 alkyl, alkoxy, alkylthio, halogeno, nitro, amino, alkyl-amino, di-alkyl-amino, hydroxy alkyl-amino, alkanoylamino, benzoylamino, N-alkanoyl-N-benzoyl-
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