40478-82-8Relevant academic research and scientific papers
[RuCl2(p-cymene)2]2 catalyzed cross dehydrogenative coupling (CDC) toward xanthone and fluorenone analogs through intramolecular C-H bond functionalization reaction
Manna, Sudipta Kumar,Manda, Srinivas Lavanya Kumar,Panda, Gautam
, p. 5759 - 5763 (2014)
A synthetic approach toward xanthone and fluorenone derivatives through ruthenium catalyzed intra-molecular C-H bond functionalization using an external oxidant has been developed. In the presence of [RuCl2(p-cymene)2]2, a variety of substituted ortho-aryloxy/aryl benzaldehydes underwent cross dehydrogenative coupling to afford the corresponding analogs in moderate to good yields.
Formation and Disproportionation of Xanthenols to Xanthenes and Xanthones and Their Use in Synthesis
Shi, Zeyu,Chen, Si,Xiao, Qiong,Yin, Dali
, p. 3334 - 3343 (2021/02/05)
A facile and versatile strategy employing TiCl4-mediated cyclization followed by a Cannizzaro reaction has been developed for the synthesis of various xanthene derivatives. The reaction proceeded smoothly to afford both xanthenes/xanthones or their sulfur derivatives and tolerated a wide range of electronically diverse substrates. Using this methodology, pranoprofen was synthesized in three steps in 59% overall yield from commercially available starting materials.
Rational design of triplet sensitizers for the transfer of excited state photochemistry from UV to visible
Booker-Milburn, Kevin,Elliott, Luke D.,George, Michael W.,Kayal, Surajit
, p. 14947 - 14956 (2020/10/13)
Time Dependent Density Functional Theory has been used to assist the design and synthesis of a series thioxanthone triplet sensitizers. Calculated energies of the triplet excited state (ET) informed both the type and position of auxochromes placed on the thioxanthone core, enabling fine-tuning of the UV-vis absorptions and associated triplet energies. The calculated results were highly consistent with experimental observation in both the order of the λmax and ET values. The synthesized compounds were then evaluated for their efficacies as triplet sensitizers in a variety of UV and visible light preparative photochemical reactions. The results of this study exceeded expectations; in particular [2 + 2] cycloaddition chemistry that had previously been sensitized in the UV was found to undergo cycloaddition at 455 nm (blue) with a 2- to 9-fold increase in productivity (g/h) relative to input power. This study demonstrates the ability of powerful modern computational methods to aid in the design of successful and productive triplet sensitized photochemical reactions.
Thioxanthone compound crystal having room temperature phosphorescent property and preparation method and use thereof
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, (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.
Synthesis of spirocyclic diarylfluorenes by one-pot twofold SNAr reactions of diaryl sulfones with diarylmethanes
Bhanuchandra,Yorimitsu, Hideki,Osuka, Atsuhiro
, 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.
Mild and general palladium-catalyzed synthesis of methyl aryl ethers enabled by the use of a palladacycle precatalyst
Cheung, Chi Wai,Buchwald, Stephen L.
supporting information, p. 3998 - 4001 (2013/09/02)
A general method for the Pd-catalyzed coupling of methanol with (hetero)aryl halides is described. The reactions proceed under mild conditions with a wide range of aryl and heteroaryl halides to give methyl aryl ethers in high yield.
Synthesis of s-pixyl derivatives for mass spectrometric applications
Khan, Safraz,Bernad, Pablo L.,Korshun, Vladimir A.,Southern, Edwin M.,Shchepinov, Mikhail S.
, p. 2453 - 2456 (2007/10/03)
Synthesis of novel S-pixyls based on the thioxanthyl skeleton is described. Thioxanthone derivatives were prepared by a regioselective intramolecular Friedel-Crafts acylation reaction and converted into S-pixyl derivatives by Grignard synthesis. S-Pixyl carbocations stabilised by electron donating groups on the thioxanthyl backbone produced exceptional mass spectra under (MA)LDI conditions (laser desorption ionisation, both with and without matrix), and can be detected down to femtomol levels. Georg Thieme Verlag Stuttgart.
Polymer-bound chiroptical molecular switches; photochemical modification of the chirality of thin films
Oosterling, Michiel L.C.M.,Schoevaars, Anne Marie,Haitjema, Henk J.,Feringa, Ben L.
, p. 341 - 348 (2007/10/03)
Photobistable chiral polymers were obtained by covalent attachment of inherently dissymmetric 2-hydroxy-9-(7′methyl-1′,2′,3′,4′- tetrahydrophenanthrene-4′-ylidene)-9H-thioxanthene to methacrylate copolymers with appropriate spacers. Upon irradiation at 300 nm the optical activity of thin films of these polymers could be altered.
Acid-Catalyzed Reactions of Ortho-Substituted Benzohydroxamic Acids in Polyphosphoric Acid (PPA)
Chhaya, P. N.,Nimbalkar, M. M.,Hosangadi, B. D.
, p. 4458 - 4460 (2007/10/02)
Ortho-substituted benzohydroxamic acids undergo a variety of reactions when treated with PPA.The nature of substituents on the ring and on the functional group CONHOH plays a key role in influencing the reaction pathways.The difference in behavior may arise due to change in site of protonation depending upon the substitution.However, no clear-cut relationship could be established as attempts to monitor reactions on NMR proved inconclusive.
