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Mitsuo Sawamoto - One of the best experts on this subject based on the ideXlab platform.
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In-Situ Direct Analysis of the Growing Species by 119Sn NMR Spectroscopy: Living Cationic Polymerization of Isobutyl Vinyl Ether with HCl/SnCl4/nBu4NCl1
Macromolecules, 1998Co-Authors: Hiroshi Katayama, Masami Kamigaito, Mitsuo SawamotoAbstract:119Sn NMR Spectroscopy was employed for analysis of the interaction and reaction of SnCl4 with the HCl−IBVE adduct [1; CH3CHCl(OiBu)] in the presence of nBu4NCl in CH2Cl2 solution at −78 °C, which are model reactions for the living cationic polymerization of isobutyl vinyl ether (IBVE). The addition of 1 to an SnCl4 solution led to upfield shifts of the tin nucleus as the 1/SnCl4 mole ratio (
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in situ direct analysis of the growing species by 119Sn NMR Spectroscopy living cationic polymerization of isobutyl vinyl ether with hcl sncl4 nbu4ncl1
Macromolecules, 1998Co-Authors: Hiroshi Katayama, Masami Kamigaito, Mitsuo SawamotoAbstract:119Sn NMR Spectroscopy was employed for analysis of the interaction and reaction of SnCl4 with the HCl−IBVE adduct [1; CH3CHCl(OiBu)] in the presence of nBu4NCl in CH2Cl2 solution at −78 °C, which are model reactions for the living cationic polymerization of isobutyl vinyl ether (IBVE). The addition of 1 to an SnCl4 solution led to upfield shifts of the tin nucleus as the 1/SnCl4 mole ratio (<1) increases, which indicates the formation of SnCl5-, via the interaction between SnCl4 and the chlorine atom in 1. On further addition of 1, the pentacoordinated anion is converted into the hexacoordinated SnCl62-. These tin species are in fast equilibrium among each other, and the 119Sn NMR analyses support the formation of a carbocation [2; CH3CH+(OiBu)] from 1 and the dynamic equilibrium between 1 and 2. More effective chloride-anion donors such as nBu4NCl and Ph3CCl can quantitatively convert SnCl4 into SnCl5-, and then into SnCl62-. Thus under the conditions where living cationic IBVE polymerization proceeds (...
Hiroshi Katayama - One of the best experts on this subject based on the ideXlab platform.
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In-Situ Direct Analysis of the Growing Species by 119Sn NMR Spectroscopy: Living Cationic Polymerization of Isobutyl Vinyl Ether with HCl/SnCl4/nBu4NCl1
Macromolecules, 1998Co-Authors: Hiroshi Katayama, Masami Kamigaito, Mitsuo SawamotoAbstract:119Sn NMR Spectroscopy was employed for analysis of the interaction and reaction of SnCl4 with the HCl−IBVE adduct [1; CH3CHCl(OiBu)] in the presence of nBu4NCl in CH2Cl2 solution at −78 °C, which are model reactions for the living cationic polymerization of isobutyl vinyl ether (IBVE). The addition of 1 to an SnCl4 solution led to upfield shifts of the tin nucleus as the 1/SnCl4 mole ratio (
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in situ direct analysis of the growing species by 119Sn NMR Spectroscopy living cationic polymerization of isobutyl vinyl ether with hcl sncl4 nbu4ncl1
Macromolecules, 1998Co-Authors: Hiroshi Katayama, Masami Kamigaito, Mitsuo SawamotoAbstract:119Sn NMR Spectroscopy was employed for analysis of the interaction and reaction of SnCl4 with the HCl−IBVE adduct [1; CH3CHCl(OiBu)] in the presence of nBu4NCl in CH2Cl2 solution at −78 °C, which are model reactions for the living cationic polymerization of isobutyl vinyl ether (IBVE). The addition of 1 to an SnCl4 solution led to upfield shifts of the tin nucleus as the 1/SnCl4 mole ratio (<1) increases, which indicates the formation of SnCl5-, via the interaction between SnCl4 and the chlorine atom in 1. On further addition of 1, the pentacoordinated anion is converted into the hexacoordinated SnCl62-. These tin species are in fast equilibrium among each other, and the 119Sn NMR analyses support the formation of a carbocation [2; CH3CH+(OiBu)] from 1 and the dynamic equilibrium between 1 and 2. More effective chloride-anion donors such as nBu4NCl and Ph3CCl can quantitatively convert SnCl4 into SnCl5-, and then into SnCl62-. Thus under the conditions where living cationic IBVE polymerization proceeds (...
Josés. Casas - One of the best experts on this subject based on the ideXlab platform.
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Triphenyltin derivatives of sulfanylcarboxylic esters.
Journal of inorganic biochemistry, 2017Co-Authors: Josés. Casas, José Sordo, Agustín Sánchez, María D. Couce, Rafael Seoane, Antonio Perez-estévez, Ezequiel M. Vázquez-lópezAbstract:The reaction of 3-(aryl)-2-sulfanylpropenoic acids [H2xspa; x: p=3-phenyl-, f=3-(2-furyl)-, t=3-(2-thienyl)-] with methanol or ethanol gave the corresponding methyl (Hxspme) or ethyl (Hxspee) esters. The reaction of these esters (HL) with triphenyltin(IV) hydroxide gave compounds of the type [SnPh3L], which were isolated and characterized as solids by elemental analysis, IR Spectroscopy and mass spectrometry and in solution by multinuclear (1H, 13C and 119Sn) NMR Spectroscopy. The structures of [SnPh3(pspme)], [SnPh3(fspme)] and [SnPh3(fspee)] were determined by X-ray diffractometry and the antimicrobial activity against E. coli, S. aureus, B. subtilis, P. aeruginosa, Resistant P. aeruginosa (a strain resistant to 'carbapenem'), and C. albicans was tested and the in vitro cytotoxic activity against the HeLa-229, A2780 and A2780cis cell lines was determined for all compounds.
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Synthesis, characterization and antibacterial activity of 3‐(2‐methoxyphenyl)‐2‐sulfanylpropenoic acid and di‐isopropylammonium [3‐(2‐methoxyphenyl)‐2‐sulfanylpropenoato] triphenylstannate(IV). The crystal structure of [HQ][SnPh3(o‐mpspa)]
Applied Organometallic Chemistry, 2006Co-Authors: Pedro Álvarez-boo, Josés. Casas, Eduardo E. Castellano, M. Delfina Couce, Rosa Farto, Eduardo Freijanes, José SordoAbstract:Reaction of 3-(2-methoxyphenyl)-2-sulfanylpropenoic acid [H2(o-mpspa)] with SnPh3OH in the presence of di-isopropylamine resulted in the formation of the complex [HQ][SnPh3(o-mpspa)] (where HQ = di-isopropylammonium cation and o-mpspa = 3-(2-methoxyphenyl)-2-sulfanylpropenoato), which was characterized by mass spectrometry and vibrational Spectroscopy, as well as by 1H, 13C and 119Sn NMR Spectroscopy. The single-crystal X-ray structural analysis of the new complex shows a trigonal-bipyramidal coordination geometry around the Sn atom where o-mpspa behaves as a bidentate chelating ligand. Dimeric units arise from the existence of NH…O hydrogen bonds between the NH2 group of the di-isopropylammonium cation and the oxygen atoms of the two neighbouring carboxylato groups. The bacteriostatic activity of the complex is also reported. Copyright © 2007 John Wiley & Sons, Ltd.
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Diorganotin(IV) complexes of dideprotonated pyridoxine (PN, vitamin B6). The crystal structures of [SnEt2(PN–2H)] · CH3OH, [SnEt2(PN–2H)(DMSO)] and [SnBu2(PN–2H)]
Journal of Organometallic Chemistry, 2004Co-Authors: Josés. Casas, José Sordo, Umberto Russo, Agustín Sánchez, Alfonso Castiñeiras, Félix Condori, María D. Couce, José M. Varela, Ezequiel M. Vázquez-lópezAbstract:Abstract The reactions of dimethyl-, diethyl- and dibutyltin(IV) oxides with pyridoxine (PN) in toluene/ethanol led to the formation of compounds [SnR2(PN–2H)] which were characterized by EI and FAB mass spectrometry and by IR, Raman, Mossbauer and 1H, 13C and 119Sn NMR Spectroscopy. The structures of [SnEt2(PN–2H)] · CH3OH, [SnBu2(PN–2H)] and [SnEt2(PN–2H)(DMSO)] were determined by X-ray diffractometry. The first two contain dimeric [SnR2(PN–2H)]2 units in which two bridging-chelating pyridoxinate anions link the Sn atoms, while in [SnEt2(PN–2H)(DMSO)] the DMSO coordinates to the tin atom via its O atom in a similar dimeric unit.
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Compounds of L(+)-ascorbic acid with dimethylthallium(III), dimethyltin(IV), and dibutyltin(IV): Synthesis, solid-state Spectroscopy (CP/MAS 13C NMR and IR), and multi-NMR behavior in aqueous solution
Journal of Inorganic Biochemistry, 1996Co-Authors: Josés. Casas, María V. Castaño, María S. García-tasende, Teresa Pérez-alvarez, Agustín Sánchez, José SordoAbstract:Reaction of L(+)-ascorbic acid (H2Asc) with TlMe2OOCCH3, SnMe2O, and SnBu2Cl2 (in this last case, in the presence of Et3N) afforded [TlMe2(HAsc)]·12C3H8O, [SnMe2(Asc)], and [SnBu2(Asc)], respectively. The new compounds were studied in the solid state by CP/MAS 13C NMR and IR Spectroscopy, and in aqueous solution by 1H, 13C, 205Tl, and 119Sn NMR Spectroscopy. The thallium compound behaves as a salt. In the tin derivatives, the metal appears to interact with the (Asc)2− anion through the O(1), O(2), and O(3) atoms of the lactone ring. Other possible weak interactions of the tin complexes in the solid state are also discussed.
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Cationic complexes of diorganotin(IV) derivatives. The crystal structure of tetrakis[1-methyl-2(3H)-imidazolinethione]diethyltin(IV) nitrate
Journal of Organometallic Chemistry, 1995Co-Authors: Josés. Casas, E.garcía Martínez, A. Sánchez González, José Sordo, Umberto Casellato, Rodolfo Graziani, Umberto RussoAbstract:Abstract [SnEt2(Hmimt)4](NO3)2 (Hmimt=1-methyl-2(3H)-imidazolinethione) has been synthesized and characterized by mass spectrometry, IR, Raman, Mossbauer, 1H, 13C and 119Sn NMR Spectroscopy, and its crystal structure determined by X-ray crystallography. The coordination distances in the centrosymmetric octahedral cation are 2.163(5) A for SnC, and 2.729(2) and 2.752(2) A for SnS, and the [SnEt2(Hmimt)4](NO3)2 units are interconnected by hydrogen bonds via their nitrate ions.
José Sordo - One of the best experts on this subject based on the ideXlab platform.
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Triphenyltin derivatives of sulfanylcarboxylic esters.
Journal of inorganic biochemistry, 2017Co-Authors: Josés. Casas, José Sordo, Agustín Sánchez, María D. Couce, Rafael Seoane, Antonio Perez-estévez, Ezequiel M. Vázquez-lópezAbstract:The reaction of 3-(aryl)-2-sulfanylpropenoic acids [H2xspa; x: p=3-phenyl-, f=3-(2-furyl)-, t=3-(2-thienyl)-] with methanol or ethanol gave the corresponding methyl (Hxspme) or ethyl (Hxspee) esters. The reaction of these esters (HL) with triphenyltin(IV) hydroxide gave compounds of the type [SnPh3L], which were isolated and characterized as solids by elemental analysis, IR Spectroscopy and mass spectrometry and in solution by multinuclear (1H, 13C and 119Sn) NMR Spectroscopy. The structures of [SnPh3(pspme)], [SnPh3(fspme)] and [SnPh3(fspee)] were determined by X-ray diffractometry and the antimicrobial activity against E. coli, S. aureus, B. subtilis, P. aeruginosa, Resistant P. aeruginosa (a strain resistant to 'carbapenem'), and C. albicans was tested and the in vitro cytotoxic activity against the HeLa-229, A2780 and A2780cis cell lines was determined for all compounds.
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Synthesis, characterization and antibacterial activity of 3‐(2‐methoxyphenyl)‐2‐sulfanylpropenoic acid and di‐isopropylammonium [3‐(2‐methoxyphenyl)‐2‐sulfanylpropenoato] triphenylstannate(IV). The crystal structure of [HQ][SnPh3(o‐mpspa)]
Applied Organometallic Chemistry, 2006Co-Authors: Pedro Álvarez-boo, Josés. Casas, Eduardo E. Castellano, M. Delfina Couce, Rosa Farto, Eduardo Freijanes, José SordoAbstract:Reaction of 3-(2-methoxyphenyl)-2-sulfanylpropenoic acid [H2(o-mpspa)] with SnPh3OH in the presence of di-isopropylamine resulted in the formation of the complex [HQ][SnPh3(o-mpspa)] (where HQ = di-isopropylammonium cation and o-mpspa = 3-(2-methoxyphenyl)-2-sulfanylpropenoato), which was characterized by mass spectrometry and vibrational Spectroscopy, as well as by 1H, 13C and 119Sn NMR Spectroscopy. The single-crystal X-ray structural analysis of the new complex shows a trigonal-bipyramidal coordination geometry around the Sn atom where o-mpspa behaves as a bidentate chelating ligand. Dimeric units arise from the existence of NH…O hydrogen bonds between the NH2 group of the di-isopropylammonium cation and the oxygen atoms of the two neighbouring carboxylato groups. The bacteriostatic activity of the complex is also reported. Copyright © 2007 John Wiley & Sons, Ltd.
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Diorganotin(IV) complexes of dideprotonated pyridoxine (PN, vitamin B6). The crystal structures of [SnEt2(PN–2H)] · CH3OH, [SnEt2(PN–2H)(DMSO)] and [SnBu2(PN–2H)]
Journal of Organometallic Chemistry, 2004Co-Authors: Josés. Casas, José Sordo, Umberto Russo, Agustín Sánchez, Alfonso Castiñeiras, Félix Condori, María D. Couce, José M. Varela, Ezequiel M. Vázquez-lópezAbstract:Abstract The reactions of dimethyl-, diethyl- and dibutyltin(IV) oxides with pyridoxine (PN) in toluene/ethanol led to the formation of compounds [SnR2(PN–2H)] which were characterized by EI and FAB mass spectrometry and by IR, Raman, Mossbauer and 1H, 13C and 119Sn NMR Spectroscopy. The structures of [SnEt2(PN–2H)] · CH3OH, [SnBu2(PN–2H)] and [SnEt2(PN–2H)(DMSO)] were determined by X-ray diffractometry. The first two contain dimeric [SnR2(PN–2H)]2 units in which two bridging-chelating pyridoxinate anions link the Sn atoms, while in [SnEt2(PN–2H)(DMSO)] the DMSO coordinates to the tin atom via its O atom in a similar dimeric unit.
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Compounds of L(+)-ascorbic acid with dimethylthallium(III), dimethyltin(IV), and dibutyltin(IV): Synthesis, solid-state Spectroscopy (CP/MAS 13C NMR and IR), and multi-NMR behavior in aqueous solution
Journal of Inorganic Biochemistry, 1996Co-Authors: Josés. Casas, María V. Castaño, María S. García-tasende, Teresa Pérez-alvarez, Agustín Sánchez, José SordoAbstract:Reaction of L(+)-ascorbic acid (H2Asc) with TlMe2OOCCH3, SnMe2O, and SnBu2Cl2 (in this last case, in the presence of Et3N) afforded [TlMe2(HAsc)]·12C3H8O, [SnMe2(Asc)], and [SnBu2(Asc)], respectively. The new compounds were studied in the solid state by CP/MAS 13C NMR and IR Spectroscopy, and in aqueous solution by 1H, 13C, 205Tl, and 119Sn NMR Spectroscopy. The thallium compound behaves as a salt. In the tin derivatives, the metal appears to interact with the (Asc)2− anion through the O(1), O(2), and O(3) atoms of the lactone ring. Other possible weak interactions of the tin complexes in the solid state are also discussed.
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Cationic complexes of diorganotin(IV) derivatives. The crystal structure of tetrakis[1-methyl-2(3H)-imidazolinethione]diethyltin(IV) nitrate
Journal of Organometallic Chemistry, 1995Co-Authors: Josés. Casas, E.garcía Martínez, A. Sánchez González, José Sordo, Umberto Casellato, Rodolfo Graziani, Umberto RussoAbstract:Abstract [SnEt2(Hmimt)4](NO3)2 (Hmimt=1-methyl-2(3H)-imidazolinethione) has been synthesized and characterized by mass spectrometry, IR, Raman, Mossbauer, 1H, 13C and 119Sn NMR Spectroscopy, and its crystal structure determined by X-ray crystallography. The coordination distances in the centrosymmetric octahedral cation are 2.163(5) A for SnC, and 2.729(2) and 2.752(2) A for SnS, and the [SnEt2(Hmimt)4](NO3)2 units are interconnected by hydrogen bonds via their nitrate ions.
Masami Kamigaito - One of the best experts on this subject based on the ideXlab platform.
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In-Situ Direct Analysis of the Growing Species by 119Sn NMR Spectroscopy: Living Cationic Polymerization of Isobutyl Vinyl Ether with HCl/SnCl4/nBu4NCl1
Macromolecules, 1998Co-Authors: Hiroshi Katayama, Masami Kamigaito, Mitsuo SawamotoAbstract:119Sn NMR Spectroscopy was employed for analysis of the interaction and reaction of SnCl4 with the HCl−IBVE adduct [1; CH3CHCl(OiBu)] in the presence of nBu4NCl in CH2Cl2 solution at −78 °C, which are model reactions for the living cationic polymerization of isobutyl vinyl ether (IBVE). The addition of 1 to an SnCl4 solution led to upfield shifts of the tin nucleus as the 1/SnCl4 mole ratio (
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in situ direct analysis of the growing species by 119Sn NMR Spectroscopy living cationic polymerization of isobutyl vinyl ether with hcl sncl4 nbu4ncl1
Macromolecules, 1998Co-Authors: Hiroshi Katayama, Masami Kamigaito, Mitsuo SawamotoAbstract:119Sn NMR Spectroscopy was employed for analysis of the interaction and reaction of SnCl4 with the HCl−IBVE adduct [1; CH3CHCl(OiBu)] in the presence of nBu4NCl in CH2Cl2 solution at −78 °C, which are model reactions for the living cationic polymerization of isobutyl vinyl ether (IBVE). The addition of 1 to an SnCl4 solution led to upfield shifts of the tin nucleus as the 1/SnCl4 mole ratio (<1) increases, which indicates the formation of SnCl5-, via the interaction between SnCl4 and the chlorine atom in 1. On further addition of 1, the pentacoordinated anion is converted into the hexacoordinated SnCl62-. These tin species are in fast equilibrium among each other, and the 119Sn NMR analyses support the formation of a carbocation [2; CH3CH+(OiBu)] from 1 and the dynamic equilibrium between 1 and 2. More effective chloride-anion donors such as nBu4NCl and Ph3CCl can quantitatively convert SnCl4 into SnCl5-, and then into SnCl62-. Thus under the conditions where living cationic IBVE polymerization proceeds (...
