Bathochromic effect of trifluoromethyl-substituted 2-naphthalen-1-yl-pyridine ligands in color tuning of iridium complexes
摘要:
A series of trifluoromethyl-substituted 2-naphthalen-1-yl-pyridine ligands and the corresponding iridium complexes have been synthesized and characterized by spectroscopic methods as well as X-ray crystallography. Upon excitation at 470 nm, (4-fnapy)(2)Ir(acac) and (5-fnapY)(2)Ir(acac) emit red photoluminescence at 617 and 613 nm, respectively. Compared to (naPY)(2)Ir(acac), the introduction of trifluoromethyl substituents resulted in a significant bathochromic shift caused by a lowering of the LUMO levels. We propose that the bathochromic effect of the nitrogen atom on the pyrimidine ring should be much weaker than expected from the work of Chi et al. [Inorg. Chem. 44 (2005) 1344]. For a blend with 6 wt% of (5-fnapy)(2)Ir(acac), a brightness of 8600 cd m(-2) at 10.5 V is reached with Commission Internationale de L'Eclairage chromaticity coordinates of x = 0.65 and y = 0.35. (c) 2006 Elsevier Ltd. All rights reserved.
Pyridine sulfinates as general nucleophilic coupling partners in palladium-catalyzed cross-coupling reactions with aryl halides
作者:Tim Markovic、Benjamin N. Rocke、David C. Blakemore、Vincent Mascitti、Michael C. Willis
DOI:10.1039/c7sc00675f
日期:——
Pyridine rings are ubiquitous in drug molecules; however, the pre-eminent reaction used to form carbon–carbon bonds in the pharmaceutical industry, the Suzuki–Miyaura cross-couplingreaction, often fails when applied to these structures. This phenomenon is most pronounced in 2-substituted pyridines, and results from the difficulty in preparing, the poor stability of, and low efficiency in reactions
An efficient room-temperature Pd-catalyzed Suzuki–Miyaura cross-coupling reaction of aryl-boronic acids with aryl chlorides is communicated here. The Pd(OAc)2/NiXantphos catalyst system enables the coupling reaction at room temperature in good to excellent yields (average yield >90%).
Nickel or Iron Catalysed Carbon-Carbon Coupling Reaction of Arylenes, Alkenes and Alkines
申请人:knochel Paul
公开号:US20100184977A1
公开(公告)日:2010-07-22
Organozinc compounds of the type R
1
—Ar
1
—ZnY (1) can be reacted with different functionalized aryl halides R
2
—Ar
2
—X (2) in the presence of catalytic amounts of Ni or Fe in a polar solvent or solvent mixture to form polyfunctional biaryles of the type R
1
—Ar
1
—Ar
2
—R
2
(3). Organozinc compounds of the type (1) can be represented by the transmetallation reaction of functionalized aryl magnesium halides or lithium aryl compounds with e.g. ZnBr
2
.
A combination of diethyl phosphite-DMAP and Ni(II) salts forms a very effective catalytic system for the cross-coupling reactions of arylzinc halides with aryl, heteroaryl, and alkenyl bromides. chlorides. triflates. and nonaflates. The choice of solvent is quite important and the mixture of THF-N-ethylpyrrolidinone (NEP) (8: 1) was found to be optimal. The reaction usually requires only 0.05 moll % of NiCl2 or Ni(acac)(2) as catalyst and proceeds at room temperature within 1-48 h. (c) 2006 Elsevier Ltd. All rights reserved.
[DE] NICKEL- ODER EISEN-KATALYSIERTE KOHLENSTOFF-KOHLENSTOFF-KUPPLUNGSREAKTION VON ARYLENEN, ALKENEN UND ALKINEN<br/>[EN] NICKEL OR IRON CATALYSED CARBON-CARBON COUPLING REACTION OF ARYLENES, ALKENES AND ALKINES<br/>[FR] REACTION DE COUPLAGE CARBONE-CARBONE ENTRE ARYLENES, ALCENES ET ALCYNES, CATALYSEE PAR NICKEL OU FER
申请人:UNIV MUENCHEN L MAXIMILIANS
公开号:WO2007031511A1
公开(公告)日:2007-03-22
[EN] According to the invention, organozink compounds of R1-Ar1-ZnY (1) type are convertible, with different functionalised aryl halides R2-Ar2-X (2) in the presence of Ni or Fe catalytic quantities in a polar solvent or a polar solvent mixture, into a polyfunctional biarylene of R1-Ar1-AR2-R2 (3) type. The type (1) organic compounds are obtainable by a transmetallisation reaction of aryl-magnesium halides or lithium-aryl compounds, for example with ZnBr2. [FR] Selon l'invention, des composés organozinciques du type R1 -Ar1-ZnY (1), peuvent est convertis avec différents halogénures d'aryle fonctionnalisés R2-Ar2-X (2), en la présence de quantités catalytiques de Ni ou de Fe, dans un solvant polaire ou un mélange de solvants polaires, en biarylène polyfonctionnel du type R1-Ar1-AR2-R2 (3). Des composés organozinciques du type (1) peuvent être obtenus par la réaction de transmétallisation d'halogénures d'arylmagnésium fonctionnalisés ou de composés de lithiumaryle, par ex. avec ZnBr2. [DE] Organozink- Verbindungen des Typs R1 -Ar1-ZnY (1) lassen sich mit verschiedenen funktionalisierten Arylhalogeniden R2-Ar2-X (2) in Gegenwart katalytischer Mengen von Ni oder Fe in einem polaren Lösungsmittel oder Lösungsmittelgemisch zu polyfunktionalen Biarylen des Typs R1-Ar1-AR2-R2 (3) umsetzen. Organozink- Verbindungen des Typs (1) können durch die Transmetallierungsreaktion funktionalisierter Arylmagnesiumhalogenide oder Lithiumarylverbindungen mit z.B. ZnBr2 dargestellt werden.