- Fluorescent bithiophene chromophores: synthesis and application in cd exciton chirality studies
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Bithiophene chromophores were synthesized and used to derivatize NH2 and OH groups in aminocyclohexane, (1R, 2R)-diaminocyclohexane, (1R, 2R)-trans-1,2-cyclohexanediol and methyl L-acosamidine for their application in the exciton chirality method. Schiff base, ester and amide derivatives were generated in good yields and were found to exhibit exciton-split CD curves. Besides their absorption at long wavelengths (red-shifted) in the visible range, the bithiophene derivatives showed fluorescence and solvatochromic properties.
- Ikemoto, Norihiro,Estevez, Isabel,Nakanishi, Koji,Berova, Nina
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- Synthesis and structural characterization of palladium(II) thiosemicarbazone complex: Application to the Buchwald-Hartwig amination reaction
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A simple route to synthesize mononuclear palladium(II) thiosemicarbazone complex has been described. Elemental analysis, spectral methods and single crystal X-ray diffraction analysis were used to confirm the composition of the complex. The new complex acts as an active homogeneous catalyst for the Buchwald-Hartwig amination reaction of a wide range of aryl and heteroaryl halides (bromides and chlorides), including activating, neutral and deactivating substrates, with various secondary amines under optimized conditions.
- Prabhu, Rupesh Narayana,Ramesh, Rengan
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p. 1120 - 1124
(2013/03/13)
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- A mild and practical copper catalyzed amination of halothiophenes
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We have found that N,N-dimethylethanolamine (deanol) is a useful solvent and ligand for copper catalyzed amination of a variety of unactivated and activated 2- or 3-halothiophenes. Primary amines, acyclic secondary amines, cyclic secondary amines and acyclic secondary amines with 2-hydroxyethyl functionality react with halothiophenes in moderate to excellent yields. The mildly basic conditions utilized are compatible with many functional groups. The amination of halobithiophenes has also been examined. The aminothiophenes produced by this method are important intermediates in a variety of electronic and optoelectronic materials. We have found that N,N-dimethylethanolamine (deanol) is a useful solvent and ligand for copper catalyzed amination of a variety of unactivated and activated 2- or 3-halothiophenes. Primary amines, acyclic secondary amines, cyclic secondary amines and acyclic secondary amines with 2-hydroxyethyl functionality react with halothiophenes providing the corresponding aminated thiophenes in moderate to excellent yields. The mildly basic conditions utilized are compatible with many functional groups. The amination of halobithiophenes has also been examined. The aminothiophenes produced by this method are important intermediates in a variety of electronic and optoelectronic materials.
- Lu, Zhikuan,Twieg, Robert J.
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p. 903 - 918
(2007/10/03)
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- Copper-catalyzed amination of aromatic halides with 2-N,N-dimethylaminoethanol as solvent
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A copper-catalyzed amination of aromatic halides under mild conditions using N,N-dimethylaminoethanol as solvent is described. We have studied this reaction in some detail varying the copper source, base, water content and other parameters including the scope of useful amine and aromatic halide structures. A variety of 4-halo-N,N-cycloalkylanilines and 2-N,N-cycloalkylaminothiophenes were synthesized for further elaboration into chromophores for optoelectronic applications.
- Lu, Zhikuan,Twieg, Robert J.,Huang, Songping D.
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p. 6289 - 6292
(2007/10/03)
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