Results 11 to 20 of about 448 (148)

Visible-light-promoted direct desulfurization of glycosyl thiols to access C-glycosides [PDF]

Nature Communications
C-Glycosides are essential for the study of biological processes and the development of carbohydrate-based drugs. Despite the tremendous hurdles, glycochemists have often fantasized about the efficient, highly stereoselective synthesis of C-glycosides ...
Demeng Xie, Wei Zeng, Jian Yang, Xiaofeng Ma   +3 more
doaj   +2 more sources

Zwitterionic Heavier Pnictinidenes in Redox Catalysis. [PDF]

Angew Chem Int Ed Engl
Zwitterionic pnictinidenes: A new class of zwitterionic heavier pnictogen species stabilized by bis(N‐heterocyclic carbene)borate ligands is reported, enabling the isolation of Sb and Bi in multiple oxidation states. These thoroughly characterized systems exhibit cationic character and engage in redox catalysis, facilitating catalytic ...
Fernando S, Chan YC, Fernandez S, Sabater E, Tizzard G, Coles SJ, Andrada DM, Planas O.   +7 more
europepmc   +3 more sources

Oxidative Addition of C-F Bonds to the Phosphoranide Ion [P(C₂F₅)₂F₂]^. [PDF]

Chemistry
The difluorobis(pentafluoroethyl)phosphoranide anion (λ$\lambda $4σ$\sigma $4‐phosphate) reacts with substrates containing activated C─F bonds (Rf = perfluoroaryl, ‐alkenyl, and ‐acetyl) yielding corresponding trifluorophoshates. The colorless solids exhibit a high thermal stability and are bench stable.
Hartmann L, Neumann B, Stammler HG, Kessler M, Hoge B.   +4 more
europepmc   +2 more sources

Anion-Π Meets H-Bonding: Tuning Synergy Through the Flexibility-to-Preorganization Transition in Anion Receptor Design. [PDF]

Chemphyschem
Three anion receptors combining both hydrogen bonding and anion‐π interactions are synthetized, involving different spacers in order to evaluate the influence of molecular preorganization and rigidity on chloride binding. The naphthalene spacer in receptor 3 leads to more effective anion binding compared to flexible or less‐structured systems.
Zayene O, Hu J, Gaucher A, Plais R, Barday M, Moreau X, Salpin JY, Prim D.   +7 more
europepmc   +2 more sources

Reaction of hydroxyl-quinoline with pentafluoropyridin. [PDF]

Springerplus, 2016
Reaction of pentafluoropyridine with 2 or 8-hydroxyl-quinoline under basic conditions in acetonitrile gives 4-oxy quinoline 2,3,5,6-tetrafluoropyridine derivatives in good yields. All the compounds were characterized using 1H, 13C, 19F-NMR and MS spectroscopy.
Beyki K, Maghsoodlou MT, Heydari R.
europepmc   +3 more sources

Charge density studies on 2,3,5,6-tetrafluoro- and pentafluoropyridine

CrystEngComm, 2013
Crystals of 2,3,5,6-tetrafluoropyridine and pentafluoropyridine have been grown by in situ methods in capillaries. The crystal structures of these compounds have been determined by X-ray diffraction up to high diffraction angles of 2θ = 100°. The charge density distributions of the crystals have been derived by multipole refinements.
Stammler, Hans-Georg, Vishnevskiy, Yury, Sicking, Constantin, Mitzel, Norbert W.   +3 more
openaire   +3 more sources

Tetrahydropyrido[3,4-b]pyrazine Scaffolds from Pentafluoropyridine

The Journal of Organic Chemistry, 2005
[reaction: see text] Representative polyfunctional tetrahydropyrido[3,4-b]pyrazine scaffolds have been synthesized very readily by a one-pot annelation reaction of pentafluoropyridine with appropriate diamines. The trifluorinated pyridopyrazine products react sequentially with various nucleophiles to give poly-substituted tetrahydropyridopyrazines ...
Sandford, G., Slater, R., Yufit, D. S., Howard, J. A. K., Vong, A.   +4 more
openaire   +4 more sources

Mesoionic N-Heterocyclic Olefins, Imines, Thiones, Phosphinidenes and Their Application in Catalysis. [PDF]

Angew Chem Int Ed Engl
This minireview covers recent advances in the synthesis, reactivity, and metal‐free catalytic uses of mesoionic N‐heterocyclic olefins (mNHOs), imines (mNHIs), thiones (mNHTs), and phosphinidenes (mNHPs). Abstract Transition metal compounds are widely known for their ability to activate small molecules and are excellent catalysts for a wide range of ...
Maji S, P S, Hansmann MM, Mandal SK.
europepmc   +2 more sources

Pentafluoropyridine as a fluorinating reagent for preparing a hydrocarbon soluble β-diketiminatolead(ii) monofluoride

Chemical Communications, 2011
A well-designed method for the preparation of β-diketiminatolead( ii ) monofluoride has been developed using LPbNMe 2 (L = [CH{C(Me)(2,6- i Pr 2 C 6
Jana, Anukul, Sarish, Sankaranarayana Pillai, Roesky, Herbert W., Leusser, Dirk, Objartel, Ina, Stalke, Dietmar   +5 more
openaire   +4 more sources

Oxidative Addition Versus Substitution Reactions of Group 14 Dialkylamino Metalylenes with Pentafluoropyridine

Inorganic Chemistry, 2013
Dialkylamino compounds of group 14 elements (Si, Ge, Sn) in the +2 oxidation state supported by benzamidinate ligands were synthesized and treated with pentafluoropyridine. Two different modes of reactivity were observed, depending on the metal atom and the basicity of the substituent at the metal.
Samuel, Prinson P., Singh, Amit Pratap, Sarish, Sankaranarayana Pillai, Matussek, Julia, Objartel, Ina, Roesky, Herbert W., Stalke, Dietmar   +6 more
openaire   +4 more sources