31696-67-0Relevant academic research and scientific papers
UV LED photoinitiator and preparation method thereof
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Paragraph 0081-0087, (2020/12/31)
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
PHOTOSTABLE MIMICS OF MACULAR PIGMENT
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Page/Page column 46, (2021/01/23)
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
Pd-Catalyzed Cross-Coupling Reactions Promoted by Biaryl Phosphorinane Ligands
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
, p. 11691 - 11708 (2019/12/02)
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.
Thioxanthone compound crystal having room temperature phosphorescent property and preparation method and use thereof
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Paragraph 0062; 0064, (2018/07/30)
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.
POLYMERIC PHOTO ACTIVE AGENTS
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Paragraph 0075, (2018/02/01)
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.
Synthesis of spirocyclic diarylfluorenes by one-pot twofold SNAr reactions of diaryl sulfones with diarylmethanes
Bhanuchandra,Yorimitsu, Hideki,Osuka, Atsuhiro
supporting information, p. 384 - 387 (2016/02/19)
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.
Copper-Catalyzed Hydroxylation of (Hetero)aryl Halides under Mild Conditions
Xia, Shanghua,Gan, Lu,Wang, Kailiang,Li, Zheng,Ma, Dawei
supporting information, p. 13493 - 13496 (2016/10/31)
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).
Palladium-catalyzed hydroxylation of aryl and heteroaryl halides enabled by the use of a palladacycle precatalyst
Cheung, Chi Wai,Buchwald, Stephen L.
, p. 5351 - 5358 (2014/06/23)
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.
A green and regioselsctive synthesis of xanthone and thioxanthone derivatives in the presence of heteropoly acid under microwave irradiation
Nasseri, Mohammad A.,Alizadeh, Somayyeh,Zakerinasb, Batol,Beni, Alireza Salimi
, p. 338 - 344 (2014/05/20)
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.
Radiation curable compositions
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Paragraph 0218; 0219; 0220, (2013/09/26)
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
