- Palladium nanoparticles catalyzed Sonogashira reactions for the one-pot synthesis of symmetrical and unsymmetrical diarylacetylenes
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A variety of symmetrical and unsymmetrical diarylacetylenes are synthesized by ligand-free palladium nanoparticles catalyzed copper-free and amine-free Sonogashira cross-coupling reactions between aryl iodides and trimethylsilylacetylene (TMSA) under mild reaction conditions.
- Mandali, Pavan Kumar,Chand, Dillip Kumar
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- Acid-base responsive switching between 3+1 and 2+2 platinum complexes
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We report that the acid-base induced changes to a cyclometallated platinum complex can be used to drive the exchange of accompanying ligands with different denticities.
- Sooksawat, Dhassida,Pike, Sarah J.,Slawin, Alexandra M.Z.,Lusby, Paul J.
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supporting information
p. 11077 - 11079
(2013/11/19)
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- N -Heterocyclic donor- and acceptor-type ligands based on 2-(1 H -[1,2,3]Triazol-4-yl)pyridines and their ruthenium(II) complexes
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New 2-(1H-[1,2,3]triazol-4-yl)pyridine bidentate ligands were synthesized as bipyridine analogs, whereas different phenylacetylene moieties of donor and acceptor nature were attached at the 5-position of the pyridine unit. The latter moieties featured a crucial influence on the electronic properties of those ligands. The N-heterocyclic ligands were coordinated to ruthenium(II) metal ions by using a bis(4,4′-dimethyl-2,2′-bipyridine)ruthenium(II) precursor. The donor or acceptor capability of the 2-(1H-[1,2,3]triazol-4-yl) pyridine ligands determined the quantum yield of the resulting ruthenium(II) complexes remarkably. Separately, 2-([1,2,3]triazol-4-yl)pyridine ligands are known to be potential quenchers, but using these new ligand systems led to room temperature emission of the corresponding ruthenium(II) complexes. The compounds have been fully characterized by elemental analysis, high-resolution ESI mass spectrometry, 1H and 13C NMR spectroscopy, and X-ray crystallography. Theoretical calculations for two ruthenium(II) complexes bearing a donor and acceptor unit, respectively, were performed to gain a deeper understanding of the photophysical behavior.
- Happ, Bobby,Escudero, Daniel,Hager, Martin D.,Friebe, Christian,Winter, Andreas,Goerls, Helmar,Altuntas, Esra,Gonzalez, Leticia,Schubert, Ulrich S.
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experimental part
p. 4025 - 4038
(2010/08/06)
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- UREA INHIBITORS OF MAP KINASES
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Urea containing compounds that inhibit MAP kinases, pharmaceutical compositions including such compounds and methods for using these compounds to treat inflammatory diseases and cancer are described herein.
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Page/Page column 26
(2010/03/04)
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- ANTIMICROBIAL INDOLINE COMPOUNDS FOR TREATMENT OF BACTERIAL INFECTIONS
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The present invention provides indoline heterocyclic compounds of the following formula I: or pharmaceutically acceptable salts, prodrugs, solvates, or hydrates thereof useful as antibacterial agents, pharmaceutical compositions containing them, methods f
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Page/Page column 38-39
(2010/04/23)
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- One-pot synthesis of 5,5′-dibromo-2,2′-dipyridylacetylene and its boronic acid derivative
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5,5′-Dibromo-2,2′-dipyridylacetylene was prepared from 2,5-dibromopyridine and (trimethylsilyl)acetylene via the new one-pot synthesis approach using a regioselective palladium-catalyzed coupling reaction with a 60% yield. Several protocols of lithium-hal
- Jeon, Hyung Joon,Choi, Jung Hoon,Kang, Jeung Ku
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scheme or table
p. 6243 - 6245
(2011/01/04)
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- High-efficiency solution processable electrophosphorescent iridium complexes bearing polyphenylphenyl dendron ligands
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We report the synthesis and electrophosphorescent behavior of a series of novel iridium complex materials (Complexes A-F), which are composed of ligands bearing polyphenylphenyl dendron groups and acetylacetonate. Yellow to saturated red organic light-emitting diodes (OLEDs) based on these newly developed Ir complexes were fabricated through solution process by doping the complex materials into polyvinyl carbazole (PVK)/2-(4-biphenylyl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole (PBD) matrices. The emission wavelengths of the materials could be effectively tuned from 549 nm to 640 nm by changing the conjugation of the ligands either through incorporating additional aromatic segment (e.g. phenyl or fluorenyl group) onto the basic dendron ligand or fusing two of the phenyl rings on the polyphenylphenyl dendron group. High performance devices with the configuration of ITO/poly(3,4-ethylenedioxythiophene):poly(styrenesulfonic acid) (PEDOT:PSS) (50 nm)/PVK:PBD (40%):Ir complex (6%) (70 nm)/2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline (BCP) (12 nm)/Alq3 (20 nm)/Mg:Ag (150 nm) have been demonstrated. For example, when Complex B was used as the emissive layer, maximum current efficiency of 34.0 cd/A and external quantum efficiency of 10.3% have been achieved. When 1,3,5-tris(N-phenylbenzimidazol-2-yl) benzene (TPBI) was used as the block layer, the efficiencies can be further improved to 46.3 cd/A and 13.9%, respectively. These solution processed OLED devices demonstrated quite stable EL efficiencies over a large range of current density, which indicated that triplet-triplet annihilation in electrophosphorescence could be effectively suppressed by incorporation of the polyphenylphenyl dendron structure into iridium complexes.
- Huang, Chun,Zhen, Chang-Gua,Su, Siew Ping,Chen, Zhi-Kuan,Liu, Xiao,Zou, De-Chun,Shi, Yan-Rong,Loh, Kian Ping
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experimental part
p. 1317 - 1324
(2009/09/06)
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- ANTIVIRAL 2-CARBOXY-THIOPHENE COMPOUNDS
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Anti-viral agents of compounds of Formula (I) : wherein A, R1, R2 and R3 are as defined in the specification, processes for their preparation and their use in HCV treatment are provided.
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Page/Page column 85-86
(2008/06/13)
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- Solution-processable polyphenylphenyl dendron bearing molecules for highly efficient blue light-emitting diodes
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(Chemical Equation Presented) Novel solution-processable blue light-emitting materials Blue A-D, bearing a polyphenylphenyl dendron, have been synthesized and characterized. The energy levels and band gaps can be facilely tuned by changing the central aro
- Huang, Chun,Zhen, Chang-Gua,Siew, Ping Su,Kian, Ping Loh,Chen, Zhi-Kuan
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p. 391 - 394
(2007/10/03)
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- A Convenient Palladium-Catalyzed Coupling Approach to 2,5-Disubstituted Pyridines
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2,5-Dibromopyridine has been found to undergo a regioselective palladium-catalyzed coupling reaction with terminal acetylenes and arylzinc halides to give the corresponding 2-alkynyl-5-bromo- and 2-aryl-5-bromopyridines, respectively, in 70percent-90percent isolated yields.To complement this chemistry, the triflate derived from 2-methyl-5-pyridinol was found to participate in a palladium-catalyzed reaction with terminal acetylenes leading to the corresponding 5-alkynyl-2-methylpyridines.These intermediates can be further manipulated to afford a broad range of 2,5-disubstituted pyridines.
- Tilley, Jefferson W.,Zawoiski, Sonja
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p. 386 - 390
(2007/10/02)
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