- Synthesis of unsymmetrically substituted bipyridines by palladium-catalyzed direct C-H arylation of pyridine N -oxides
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Chemical equations presented. Substituted bipyridines were efficiently prepared by direct coupling between pyridine N-oxides and halopyridines using a palladium catalyst. Pyridine N-oxides with electron-withdrawing substitutents gave the best yields. This method allows the convenient preparation of 2,2′-, 2,3′-, and 2,4′-bipyridines which are useful as functionalized ligands for metal complexes or as building blocks for supramolecular architectures.
- Duric, Sasa,Tzschucke, C. Christoph
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supporting information; experimental part
p. 2310 - 2313
(2011/06/28)
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- Functional polypyridine ligands from copper-mediated room temperature coupling of 4-chloro-2-trimethylsilylpyridine
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A range of functional polypyridine ligands (bipyridines and terpyridine) has been synthesized by copper-mediated oxidative homocoupling of 4-chloro-2-trimethylsilylpyridine or cross-coupling with functional bromopyridines. The reaction proceeded smoothly at room temperature.
- Lou?rat, Frédéric,Gros, Philippe C.
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supporting information; experimental part
p. 3558 - 3560
(2010/08/07)
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- Hiyama cross-coupling of chloro-, fluoro-, and methoxypyridyltrimethylsilanes: Room-temperature novel access to functional bi(het)aryl
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(Chemical Equation Presented) The incorporation of chloro, fluoro, or methoxy substituents on the pyridine ring of pyridyltrimethylsilanes allowed us to perform efficient Hiyama cross-coupling with various (het)aryl halides. The reactions proceeded smoothly at room temperature leading to the corresponding functional bis(het)aryl in fair to excellent yields. The presence of pyridine nitrogen α to the trimethylsilyl group was requisite to achieve the cross-coupling.
- Pierrat, Philippe,Gros, Philippe,Fort, Yves
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p. 697 - 700
(2007/10/03)
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- A convenient set of bidentate pyridine ligands for combinatorial synthesis
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Synthesis is reported of five pyridine-containing bidentate ligands bearing nucleophilic groups at different positions. Their efficient solid- phase alkylation was demonstrated in the synthesis of a small library. These ligands are attractive building blocks for the construction of libraries of metal-binding compounds for various purposes.
- Wang, Fen,Schwabacher, Alan W.
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p. 4779 - 4782
(2007/10/03)
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- 6-Amino-2,2'-bipyridine as a new fluorescent organic compound
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6,6'-Diamino-2,2'-bipyridine (1a) has been found to exhibit a strong fluorescence in the near-UV region.Some amino and/or chloro substituted bipyridines (bpys) have been synthesized an studied to show that only 6-amino-substtuted derivatives exhibited a strong emission.The emission of 6-amino-6'-chloro-bpy (3a) was the strongest (λmax = 429.0 nm; Φ = 0.78 in ethanol) among them.On the other hand, little or no emission was observed for monochloro-, dichloro- and 4-amino- derivatives.
- Araki, Koji,Mutai, Toshiki,Shigemitsu, Yasuhiro,Yamada, Masaki,Nakajima, Takayoshi,et al.
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p. 613 - 618
(2007/10/03)
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- LUMINESCENT METAL COMPLEXES. PART 1. TRIS-CHELATES OF SUBSTITUTED 2,2'-BIPYRIDYLS WITH RUTHENIUM(II) AS DYES FOR LUMINESCENT SOLAR COLLECTORS
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Ruthenium(II) and osmium(II) complexes of 2,2'bipyridyls (bipy) and 1,10-phenanthrolines (phen) are identified as feasible dyes for use in luminecsent solar collectors.Twenty-seven RuII)bipy)32+ complexes are prepared and the absorption and emission spectra of their solutions in EtOH-MeOH at room temperature are reported.Quantum efficiencies, wich are sensitive to oxygen quenching, vary between 0.002 and 0.306 depending upon substituents.The effect of the medium on the spectral properties of selected compounds has also been investigated.Measured quantum yields of non-aqueous solutions are higher than those for aqueous solutions but lower than for doped plastic films.
- Cook, Michael J.,Lewis, Anthony P.,McAuliffe, Glenn S. G.,Skarda, Vladimir,Thomson, Andrew J.,et. al.
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p. 1293 - 1302
(2007/10/02)
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