211617-68-4Relevant articles and documents
Fluorescent probe for fluorine ion detection, application of fluorescent probe and method for detecting fluorine ions in to-be-detected sample
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Paragraph 0047; 0052; 0060-0061, (2021/08/06)
The invention belongs to the technical field of analytical chemistry, and particularly relates to a fluorescent probe for fluorine ion detection, application of the fluorescent probe and a method for detecting fluorine ions in a to-be-detected sample. The invention provides a compound as shown in a formula I, or an optical isomer or salt thereof, and provides application of the compound as a fluorine ion detection fluorescent probe. According to the method for detecting the fluorine ions in the to-be-detected sample, the compound, or the optical isomer or the salt of the compound is used as a fluorine ion detection fluorescent probe for detection. The fluorescent probe has the advantages of good water solubility, high selectivity, high response speed, low detection limit, good stability, wide applicable pH range and good application prospect.
Cu/Chiral Phosphoric Acid-Catalyzed Asymmetric Three-Component Radical-Initiated 1,2-Dicarbofunctionalization of Alkenes
Lin, Jin-Shun,Li, Tao-Tao,Liu, Ji-Ren,Jiao, Guan-Yuan,Gu, Qiang-Shuai,Cheng, Jiang-Tao,Guo, Yu-Long,Hong, Xin,Liu, Xin-Yuan
supporting information, p. 1074 - 1083 (2019/01/11)
An asymmetric intermolecular, three-component radical-initiated dicarbofunctionalization of 1,1-diarylalkenes with diverse carbon-centered radical precursors and electron-rich heteroaromatics by a copper(I) and chiral phosphoric acid cooperative catalysis strategy has been developed, providing straightforward access to chiral triarylmethanes bearing quaternary all-carbon stereocenters with high efficiency as well as excellent chemo- and enantioselectivity. The key to success is not only the introduction of a sterically demanding chiral phosphoric acid to favor radical difunctionalization over the otherwise remarkable side reactions but also the in situ generation of carbocation intermediates from benzylic radical to realize asymmetric induction with the aid of a removable hydroxy directing group via cooperative interactions with chiral phosphate. Density functional theory calculations elucidated the critical chiral environment created by the hydrogen-bonding and ion-pair interactions between the chiral phosphoric acid catalyst and substrates, which leads to the enantioselective C-C bond formation.
Carbonyl–Olefin Cross-Metathesis Through a Visible-Light-Induced 1,3-Diol Formation and Fragmentation Sequence
Pitzer, Lena,Sandfort, Frederik,Strieth-Kalthoff, Felix,Glorius, Frank
supporting information, p. 16219 - 16223 (2018/11/23)
A visible-light-mediated approach to carbonyl–olefin cross-metathesis is described. Photoinduced hole catalysis was used to promote the formation of 1,3-diols from aldehydes and styrenes, which were then readily fragmented under acidic conditions to form the cross-metathesis products. The use of 1,3-diols as intermediates, rather than the energetically more demanding oxetanes, provides a new, orthogonal mechanistic strategy for carbonyl–olefin cross-metathesis. Furthermore, this approach does not require any metals, ligands, or additives, and provides the products with high levels of E selectivity. A mechanistic rationale is provided and supported by both theoretical calculations and experiments. Additionally, a practical synthesis of a new acridinium-based photocatalyst, including full characterization, is presented.
