The Experts below are selected from a list of 327 Experts worldwide ranked by ideXlab platform
Marcos A P Martins - One of the best experts on this subject based on the ideXlab platform.
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synthesis 11B and 19f NMR Spectroscopy and optical and electrochemical properties of novel 9 aryl 3 aryl heteroaryl 1 1 difluoro 7 trifluoromethyl 1h 1 3 5 2 oxadiazaborinino 3 4 a 1 8 naphthyridin 11 ium 1 uide complexes
Tetrahedron Letters, 2016Co-Authors: Helio G Bonacorso, Tainara P Calheiro, Bernardo A Iglesias, Iuri R C Berni, Eufrânio N Da Silva, Joao Rocha, Nilo Zanatta, Marcos A P MartinsAbstract:Abstract A new series of nine examples of 9-aryl-3-(aryl/heteroaryl)-1,1-difluoro-7-(trifluoromethyl)-1H-[1,3,5,2]oxadiazaborinino[3,4-a][1,8]naphthyridin-11-ium-1-uides, which contained 1,8-naphthyridine-based boron complexes with variable ligand structures, were synthesized at yields of 50–65% from the reaction of unpublished 2-benzoylamino-7-aryl(heteroaryl)-5-trifluoromethyl-1,8-naphthyridines—in which aryl(heteroaryl) = phenyl, 4-MeC6H4, 4-FC6H4, 4-BrC6H4, 4-OMeC6H4, 4-NO2C6H4, and 2-thienyl—with BF3·Et2O and fully characterized by 1H-, 13C-, 19F-, and 11B NMR Spectroscopy and X-ray diffractometry. The optical and electrochemical properties of the new complexes were investigated, and the results for quantum yield calculations, Stokes shift, UV–vis, fluorescence, and redox potential data analysis indicated an important relationship with the aryl(heteroaryl) substituents attached to the 3- and 9-position of the naphthyridine boron complexes.
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Synthesis, 11B- and 19F NMR Spectroscopy, and optical and electrochemical properties of novel 9-aryl-3-(aryl/heteroaryl)-1,1-difluoro-7-(trifluoromethyl)-1H-[1,3,5,2]oxadiazaborinino[3,4-a][1,8]naphthyridin-11-ium-1-uide complexes
Tetrahedron Letters, 2016Co-Authors: Helio G Bonacorso, Tainara P Calheiro, Bernardo A Iglesias, Iuri R C Berni, Joao Rocha, Nilo Zanatta, Eufrânio N. Da Silva Júnior, Marcos A P MartinsAbstract:Abstract A new series of nine examples of 9-aryl-3-(aryl/heteroaryl)-1,1-difluoro-7-(trifluoromethyl)-1H-[1,3,5,2]oxadiazaborinino[3,4-a][1,8]naphthyridin-11-ium-1-uides, which contained 1,8-naphthyridine-based boron complexes with variable ligand structures, were synthesized at yields of 50–65% from the reaction of unpublished 2-benzoylamino-7-aryl(heteroaryl)-5-trifluoromethyl-1,8-naphthyridines—in which aryl(heteroaryl) = phenyl, 4-MeC6H4, 4-FC6H4, 4-BrC6H4, 4-OMeC6H4, 4-NO2C6H4, and 2-thienyl—with BF3·Et2O and fully characterized by 1H-, 13C-, 19F-, and 11B NMR Spectroscopy and X-ray diffractometry. The optical and electrochemical properties of the new complexes were investigated, and the results for quantum yield calculations, Stokes shift, UV–vis, fluorescence, and redox potential data analysis indicated an important relationship with the aryl(heteroaryl) substituents attached to the 3- and 9-position of the naphthyridine boron complexes.
Bradley D. Smith - One of the best experts on this subject based on the ideXlab platform.
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Direct observation of a tetrahedral boronic acid–β-lactamase complex using 11B NMR Spectroscopy
J. Chem. Soc. Chem. Commun., 1991Co-Authors: Jack E. Baldwin, Timothy D. W. Claridge, Andrew E. Derome, Bradley D. Smith, Mark Twyman, Stephen G. WaleyAbstract:A tetrahedral boronic acid–β-lactamase complex formed by treatment of the P99 β-lactamase enzyme from Enterobacter cloacae with 3-dansylamidophenylboronic acid has been directly observed using 11B NMR Spectroscopy.
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direct observation of a tetrahedral boronic acid β lactamase complex using 11B NMR Spectroscopy
Journal of The Chemical Society Chemical Communications, 1991Co-Authors: Jack E. Baldwin, Timothy D. W. Claridge, Andrew E. Derome, Bradley D. Smith, Mark Twyman, Stephen G. WaleyAbstract:A tetrahedral boronic acid–β-lactamase complex formed by treatment of the P99 β-lactamase enzyme from Enterobacter cloacae with 3-dansylamidophenylboronic acid has been directly observed using 11B NMR Spectroscopy.
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11B NMR studies of an aryl boronic acid bound to chymotrypsin and subtilisin
Bioorganic & Medicinal Chemistry Letters, 1991Co-Authors: Jack E. Baldwin, Timothy D. W. Claridge, Andrew E. Derome, Christopher J. Schofield, Bradley D. SmithAbstract:Abstract The binding of aryl boronic acids to α-chymotrypsin and subtilisin has been studied by 11B NMR Spectroscopy; evidence is provided for the direct spectroscopic observation of a tetrahedral enzyme/boromate complex.
John A. Maguire - One of the best experts on this subject based on the ideXlab platform.
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synthesis of the novel ionic liquid n pentylpyridinium closo cb11h12 and its usage as a reaction medium in catalytic dehalogenation of aromatic halides
Applied Organometallic Chemistry, 2003Co-Authors: Yinghuai Zhu, Narayan S. Hosmane, Chi Bun Ching, Keith Carpenter, Selvasothi Selvaratnam, John A. MaguireAbstract:The novel, low-melting-point (19 °C) salt [N-pentylpyridinium]+ [closo-CB11H12]−(2) was synthesized in 93% yield and characterized by elemental analysis, IR Spectroscopy, and 1H, 13C, and 11B NMR Spectroscopy. The salt was used as a solvent in several dehalogenation reactions of mono- and poly-chlorides and -bromides, catalyzed by the palladium complexes PdCl2(PPh3)2, PdCl2(dppe), and PdCl2(dppf). Complete debromination of C6Br6, 1,2,4,5-tetrabromobenzene, C60Br8, and C60Br24 was accomplished quite rapidly, whereas dechlorination of 1,2,4-trichlorobenzene proceeded more slowly, but with excellent products selectivity. Copyright © 2003 John Wiley & Sons, Ltd.
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Synthesis of the novel ionic liquid [N-pentylpyridinium]+[closo-CB11H12]- and its usage as a reaction medium in catalytic dehalogenation of aromatic halides
Applied Organometallic Chemistry, 2003Co-Authors: Yinghuai Zhu, Narayan S. Hosmane, Chi Bun Ching, Keith Carpenter, Selvasothi Selvaratnam, John A. MaguireAbstract:The novel, low-melting-point (19 °C) salt [N-pentylpyridinium]+ [closo-CB11H12]−(2) was synthesized in 93% yield and characterized by elemental analysis, IR Spectroscopy, and 1H, 13C, and 11B NMR Spectroscopy. The salt was used as a solvent in several dehalogenation reactions of mono- and poly-chlorides and -bromides, catalyzed by the palladium complexes PdCl2(PPh3)2, PdCl2(dppe), and PdCl2(dppf). Complete debromination of C6Br6, 1,2,4,5-tetrabromobenzene, C60Br8, and C60Br24 was accomplished quite rapidly, whereas dechlorination of 1,2,4-trichlorobenzene proceeded more slowly, but with excellent products selectivity. Copyright © 2003 John Wiley & Sons, Ltd.
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Thermal Conversion of closo−1,2‐(SiMe3)2−1,2‐C2B4H4 to closo‐1,6‐(SiMe3)2−1,6‐C2B4H4: Structure Determination by Ab Initio Calculations, Gas‐Phase Electron Diffraction, and Low‐Temperature X‐Ray Diffraction
Chemistry - A European Journal, 1997Co-Authors: John A. Maguire, Colacot J. Thomas, Thomas G. Gray, Ying Wang, Jason F. Eintracht, Narayan S. Hosmane, Herbert Binder, Michael Wanitschek, Horst BorrmannAbstract:closo−1,2-(SiMe3)2−1,2-C2B4H4 undergoes thermal conversion to 1,6-(SiMe3)2−1,6-C2B4H4. The reaction pathway was monitored by 11B NMR Spectroscopy. The structures of the 1,2- and 1,6-isomers were optimized at the HF/6-31 G* ab initio level. Gas-phase electron diffraction studies for both isomers are reported, as well as low-temperature X-ray crystal structure determinations. Comparison of calculated structural data with the data obtained experimentally shows good agreement between theory and experiment.
Jack E. Baldwin - One of the best experts on this subject based on the ideXlab platform.
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Direct observation of a tetrahedral boronic acid–β-lactamase complex using 11B NMR Spectroscopy
J. Chem. Soc. Chem. Commun., 1991Co-Authors: Jack E. Baldwin, Timothy D. W. Claridge, Andrew E. Derome, Bradley D. Smith, Mark Twyman, Stephen G. WaleyAbstract:A tetrahedral boronic acid–β-lactamase complex formed by treatment of the P99 β-lactamase enzyme from Enterobacter cloacae with 3-dansylamidophenylboronic acid has been directly observed using 11B NMR Spectroscopy.
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direct observation of a tetrahedral boronic acid β lactamase complex using 11B NMR Spectroscopy
Journal of The Chemical Society Chemical Communications, 1991Co-Authors: Jack E. Baldwin, Timothy D. W. Claridge, Andrew E. Derome, Bradley D. Smith, Mark Twyman, Stephen G. WaleyAbstract:A tetrahedral boronic acid–β-lactamase complex formed by treatment of the P99 β-lactamase enzyme from Enterobacter cloacae with 3-dansylamidophenylboronic acid has been directly observed using 11B NMR Spectroscopy.
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11B NMR studies of an aryl boronic acid bound to chymotrypsin and subtilisin
Bioorganic & Medicinal Chemistry Letters, 1991Co-Authors: Jack E. Baldwin, Timothy D. W. Claridge, Andrew E. Derome, Christopher J. Schofield, Bradley D. SmithAbstract:Abstract The binding of aryl boronic acids to α-chymotrypsin and subtilisin has been studied by 11B NMR Spectroscopy; evidence is provided for the direct spectroscopic observation of a tetrahedral enzyme/boromate complex.
Helio G Bonacorso - One of the best experts on this subject based on the ideXlab platform.
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synthesis 11B and 19f NMR Spectroscopy and optical and electrochemical properties of novel 9 aryl 3 aryl heteroaryl 1 1 difluoro 7 trifluoromethyl 1h 1 3 5 2 oxadiazaborinino 3 4 a 1 8 naphthyridin 11 ium 1 uide complexes
Tetrahedron Letters, 2016Co-Authors: Helio G Bonacorso, Tainara P Calheiro, Bernardo A Iglesias, Iuri R C Berni, Eufrânio N Da Silva, Joao Rocha, Nilo Zanatta, Marcos A P MartinsAbstract:Abstract A new series of nine examples of 9-aryl-3-(aryl/heteroaryl)-1,1-difluoro-7-(trifluoromethyl)-1H-[1,3,5,2]oxadiazaborinino[3,4-a][1,8]naphthyridin-11-ium-1-uides, which contained 1,8-naphthyridine-based boron complexes with variable ligand structures, were synthesized at yields of 50–65% from the reaction of unpublished 2-benzoylamino-7-aryl(heteroaryl)-5-trifluoromethyl-1,8-naphthyridines—in which aryl(heteroaryl) = phenyl, 4-MeC6H4, 4-FC6H4, 4-BrC6H4, 4-OMeC6H4, 4-NO2C6H4, and 2-thienyl—with BF3·Et2O and fully characterized by 1H-, 13C-, 19F-, and 11B NMR Spectroscopy and X-ray diffractometry. The optical and electrochemical properties of the new complexes were investigated, and the results for quantum yield calculations, Stokes shift, UV–vis, fluorescence, and redox potential data analysis indicated an important relationship with the aryl(heteroaryl) substituents attached to the 3- and 9-position of the naphthyridine boron complexes.
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Synthesis, 11B- and 19F NMR Spectroscopy, and optical and electrochemical properties of novel 9-aryl-3-(aryl/heteroaryl)-1,1-difluoro-7-(trifluoromethyl)-1H-[1,3,5,2]oxadiazaborinino[3,4-a][1,8]naphthyridin-11-ium-1-uide complexes
Tetrahedron Letters, 2016Co-Authors: Helio G Bonacorso, Tainara P Calheiro, Bernardo A Iglesias, Iuri R C Berni, Joao Rocha, Nilo Zanatta, Eufrânio N. Da Silva Júnior, Marcos A P MartinsAbstract:Abstract A new series of nine examples of 9-aryl-3-(aryl/heteroaryl)-1,1-difluoro-7-(trifluoromethyl)-1H-[1,3,5,2]oxadiazaborinino[3,4-a][1,8]naphthyridin-11-ium-1-uides, which contained 1,8-naphthyridine-based boron complexes with variable ligand structures, were synthesized at yields of 50–65% from the reaction of unpublished 2-benzoylamino-7-aryl(heteroaryl)-5-trifluoromethyl-1,8-naphthyridines—in which aryl(heteroaryl) = phenyl, 4-MeC6H4, 4-FC6H4, 4-BrC6H4, 4-OMeC6H4, 4-NO2C6H4, and 2-thienyl—with BF3·Et2O and fully characterized by 1H-, 13C-, 19F-, and 11B NMR Spectroscopy and X-ray diffractometry. The optical and electrochemical properties of the new complexes were investigated, and the results for quantum yield calculations, Stokes shift, UV–vis, fluorescence, and redox potential data analysis indicated an important relationship with the aryl(heteroaryl) substituents attached to the 3- and 9-position of the naphthyridine boron complexes.
