- INTRAMOLECULAR EXCHANGE COUPLING OF ARYLNITRENES BY OXYGEN
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A series of m,n'-diazidodiphenyl ethers (m -1, and also showed a weak dinitrene quintet spectrum with /D/hc/=0.162 cm-1 having ESR spectral intensity vs temperature dependence (Curie law) consistent with either a high-spin ground state or a very small singlet-quintet gap.Di(3-azidophenyl) ether gave a strong mononitrene peak with /D/hc/=0.996 cm-1 and a quintet dinitrene ESR spectrum (/D/hc/=0.162 cm-1) which exhibited non-linear Curie law intensity behavior consistent with the quintet being a thermally populated excited state 40 cal mol-1 above a singlet ground state.Di(4-azidophenyl) ether gave a strong mononitrene peak with /D/hc/=0.961 cm-1, but no observable spectrum related to a high-spin open-shell dinitrene.The results are consistent with oxygen being a weak exchange coupling linker in pi-conjugated open-shell molecules.The observed ground-state spin multiplicities are in accord with qualitative superexchange and connectivity models, despite any perturbations due to resonance effects between the oxygen linker and p-nitrene sites.
- Minato, Masaki,Lahti, Paul M.
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Read Online
- ORGANIC ELECTROLUMINESCENT MATERIALS AND DEVICES
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A compound of Formula I is disclosed.
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Paragraph 0125
(2019/06/15)
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- Organic electroluminescent materials and devices
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Novel phosphorescent platinum complexes containing tetradentate ligands are provided. The disclosed compounds have three 6-membered metallocycle units in each tertadentate ligand. The disclosed compounds have desirable electronic properties that make them useful when incorporated into a variety of OLED devices.
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Page/Page column 195-196
(2016/10/27)
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- A common diaryl ether intermediate for the gram-scale synthesis of oxazine and xanthene fluorophores
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Common ground: Copper-catalyzed coupling reactions can be used for the high-yielding preparation of widely used oxazine and xanthene fluorophores from a common diaryl ether intermediate on a gram-scale (see scheme). This general approach may facilitate th
- Anzalone, Andrew V.,Wang, Tracy Y.,Chen, Zhixing,Cornish, Virginia W.
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supporting information
p. 650 - 654
(2013/02/23)
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- Orthogonal Cu- and Pd-based catalyst systems for the O- and N-arylation of aminophenols
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O- or N-arylated aminophenol products constitute a common structural motif in various potentially useful therapeutic agents and/or drug candidates. We have developed a complementary set of Cu- and Pd-based catalyst systems for the selective O- and N-arylation of unprotected aminophenols using aryl halides. Selective O-arylation of 3- and 4-aminophenols is achieved with copper-catalyzed methods employing picolinic acid or CyDMEDA, trans-N,N′-dimethyl-1,2- cyclohexanediamine, respectively, as the ligand. The selective formation of N-arylated products of 3- and 4-aminophenols can be obtained with BrettPhos precatalyst, a biarylmonophosphine-based palladium catalyst. 2-Aminophenol can be selectively N-arylated with CuI, although no system for the selective O-arylation could be found. Coupling partners with diverse electronic properties and a variety of functional groups can be selectively transformed under these conditions.
- Maiti, Debabrata,Buchwald, Stephen L.
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supporting information; experimental part
p. 17423 - 17429
(2010/03/25)
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- Synthesis and characterization of a new red-emitting Ca2+ indicator, calcium ruby
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Equation Presented Calcium Ruby m-Cl (X = H, Y = Cl) is a visible-light excited red-emitting calcium concentration ([Ca2+]) indicator dye (579/598 nm peak excitation/emission) with a side arm for conjugation via EDC or click chemistry. Its larg
- Gaillard, Stephane,Yakovlev, Aleksey,Luccardini, Camilla,Oheim, Martin,Feltz, Anne,Mallet, Jean-Maurice
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p. 2629 - 2632
(2008/02/10)
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- Effect of synthesis conditions on formation of partially crystalline polyimides based on meta-substituted binuclear diamines
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Partially crystalline polyimides were prepared from 3,3′,4,4′-benzophenonetetracarboxylic acid and meta-substituted binuclear diamines. The products exhibit clearly pronounced softening and melting points, which are lower than the temperature of the onset of thermal degradation.
- Kudryavtsev,Meleshko,Kalbin,Bogorad,Lukasov,Baklagina
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p. 2171 - 2176
(2007/10/03)
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- Thermoplastic resin composition and a method of molding the same
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This invention provides a thermoplastic resin composition comprising a thermoplastic resin and 0.1 to 100 parts by weight, per 100 parts by weight of the thermoplastic resin, of an imide compound prepared, e.g., by dehydration condensation of 1,2,3,4-butanetetracarboxylic acid or a monoanhydride or a dianhydride thereof with a primary amine, and a method of molding the resin composition.
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