15268-07-2Relevant articles and documents
INTRAMOLECULAR EXCHANGE COUPLING OF ARYLNITRENES BY OXYGEN
Minato, Masaki,Lahti, Paul M.
, p. 495 - 502 (1994)
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.
Organic electroluminescent materials and devices
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Page/Page column 195-196, (2016/10/27)
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.
Orthogonal Cu- and Pd-based catalyst systems for the O- and N-arylation of aminophenols
Maiti, Debabrata,Buchwald, Stephen L.
supporting information; experimental part, p. 17423 - 17429 (2010/03/25)
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.
