2797-28-6Relevant articles and documents
Lewis Superacidic Catecholato Phosphonium Ions: Phosphorus-Ligand Cooperative C-H Bond Activation
Greb, Lutz,Roth, Daniel,Stephan, Douglas W.,Stirn, Judith
supporting information, p. 15845 - 15851 (2021/10/02)
A series of catecholato phosphonium ions, including the first stable bis(catecholato)-substituted derivatives, are isolated and fully characterized. The cations rank among the most potent literature-known Lewis acids on the Gutmann-Beckett and ion affinit
Alkane-soluble tetra(pentafluorophenyl)borate as well as preparation method and application thereof
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Paragraph 0131-0134, (2021/10/27)
The invention discloses alkane-soluble tetra(pentafluorophenyl)borate, the structural formula of which is as shown in formula I; in the formula I, R represents 1-hexyl (C6H13), 1-octyl (C8H17), 1-decyl (C10H21) or dodecyl (C12H25), and the substitution position on a benzene ring is ortho-position, meta-position or para-position. The invention also provides a preparation method of the alkane-soluble tetra(pentafluorophenyl)borate and application of the alkane-soluble tetra(pentafluorophenyl)borate in olefin polymerization reaction. The alkane-soluble tetra(pentafluorophenyl)borate provided by the invention not only can be dissolved in a conventional toluene dichloromethane solvent, but also can be dissolved in non-polar straight-chain alkane and cycloalkane solvents. Meanwhile, the compound can serve as a cocatalyst to catalyze olefin polymerization, so that a main catalyst can be efficiently activated to form a high-activity catalyst, ethylene can be catalyzed to polymerize in a non-polar solvent, and a high-performance polyolefin material is prepared.
Vinyl Carbocations Generated under Basic Conditions and Their Intramolecular C-H Insertion Reactions
Wigman, Benjamin,Popov, Stasik,Bagdasarian, Alex L.,Shao, Brian,Benton, Tyler R.,Williams, Chloé G.,Fisher, Steven P.,Lavallo, Vincent,Houk,Nelson, Hosea M.
supporting information, p. 9140 - 9144 (2019/06/08)
Here we report the surprising discovery that high-energy vinyl carbocations can be generated under strongly basic conditions, and that they engage in intramolecular sp3 C-H insertion reactions through the catalysis of weakly coordinating anion salts. This approach relies on the unconventional combination of lithium hexamethyldisilazide base and the commercially available catalyst, triphenylmethylium tetrakis(pentafluorophenyl)borate. These reagents form a catalytically active lithium species that enables the application of vinyl cation C-H insertion reactions to heteroatom-containing substrates.