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Xigeng Zhou - One of the best experts on this subject based on the ideXlab platform.
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Lanthanide-Catalyzed Reversible Alkynyl Exchange by Carbon—Carbon Single-Bond Cleavage Assisted by a Secondary Amino Group.
ChemInform, 2016Co-Authors: Yinlin Shao, Fangjun Zhang, Jie Zhang, Xigeng ZhouAbstract:Lanthanide-catalyzed alkynyl exchange through C—C single-bond cleavage assisted by a Secondary Amino Group is reported.
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lanthanide catalyzed reversible alkynyl exchange by carbon carbon single bond cleavage assisted by a Secondary Amino Group
ChemInform, 2016Co-Authors: Yinlin Shao, Fangjun Zhang, Jie Zhang, Xigeng ZhouAbstract:Lanthanide-catalyzed alkynyl exchange through C—C single-bond cleavage assisted by a Secondary Amino Group is reported.
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lanthanide catalyzed reversible alkynyl exchange by carbon carbon single bond cleavage assisted by a Secondary Amino Group
Angewandte Chemie, 2016Co-Authors: Yinlin Shao, Fangjun Zhang, Jie Zhang, Xigeng ZhouAbstract:Lanthanide-catalyzed alkynyl exchange through C−C single-bond cleavage assisted by a Secondary Amino Group is reported. A lanthanide amido complex is proposed as a key intermediate, which undergoes unprecedented reversible β-alkynyl elimination followed by alkynyl exchange and imine reinsertion. The in situ homo- and cross-dimerization of the liberated alkyne can serve as an additional driving force to shift the metathesis equilibrium to completion. This reaction is formally complementary to conventional alkyne metathesis and allows the selective transformation of internal propargylamines into those bearing different substituents on the alkyne terminus in moderate to excellent yields under operationally simple reaction conditions.
Yeon Tae Jeong - One of the best experts on this subject based on the ideXlab platform.
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2,4-Bis(4-but-oxy-phen-yl)-3-aza-bicyclo-[3.3.1]nonan-9-one.
Acta Crystallographica Section E Structure Reports Online, 2011Co-Authors: P Parthiban, V Ramkumar, Yeon Tae JeongAbstract:In the title compound, C28H37NO3, a crystallographic mirror plane bisects the molecule (one half-molecule in the asymmetric unit). The title compound exists in a twin-chair conformation with an equatorial orientation of the 4-butoxyphenyl Groups. Both sides of the Secondary Amino Group carry the 4-butoxyphenyl Groups at an angle of 38.54 (3)° with respect to one another.
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2,4-Bis(4-chloro-phen-yl)-1-methyl-3-aza-bicyclo-[3.3.1]nonan-9-one.
Acta crystallographica. Section E Structure reports online, 2010Co-Authors: P Parthiban, V Ramkumar, Yeon Tae JeongAbstract:The title compound, C(21)H(21)Cl(2)NO, exists in a twin-chair conformation with an equatorial orientation of the 4-chloro-phenyl Groups on both sides of the Secondary Amino Group; the dihedral angle between the 4-chloro-phenyl rings is 36.58 (2)°. The crystal packing is stabilized by an inter-molecular N-H⋯O hydrogen bond and a weak Cl⋯Cl [3.4331 (9) Å] inter-action.
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2,4-Bis(3-methoxy-phen-yl)-3-aza-bicyclo-[3.3.1]nonan-9-one.
Acta crystallographica. Section E Structure reports online, 2009Co-Authors: P Parthiban, V Ramkumar, Yeon Tae JeongAbstract:In the crystal structure, the title compound, C(22)H(25)NO(3), exists in a twin-chair conformation with equatorial orientations of the meta-methoxy-phenyl Groups on both sides of the Secondary Amino Group. The title compound is a positional isomer of 2,4-bis-(2-methoxy-phen-yl)-3-aza-bicyclo-[3.3.1]nonan-9-one and 2,4-bis-(4-methoxy-phen-yl)-3-aza-bicyclo-[3.3.1]nonan-9-one, which both also exhibit twin-chair conformations with equatorial dispositions of the anisyl rings on both sides of the Secondary Amino Group. In the title compound, the meta-methoxy-phenyl rings are orientated at an angle of 25.02 (3)° with respect to each other, whereas in the ortho and para isomers, the anisyl rings are orientated at dihedral angles of 33.86 (3) and 37.43 (4)°, respectively. The crystal packing is dominated by van der Waals inter-actions and by an inter-molecular N-H⋯O hydrogen bond, whereas in the ortho isomer, an inter-molecular N-H⋯π inter-action (H⋯Cg = 2.75 Å) is found.
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2,4-Bis(3-methoxyphenyl)-3-azabicyclo[3.3.1]nonan-9-one
Acta Crystallographica Section E Structure Reports Online, 2009Co-Authors: P Parthiban, V Ramkumar, Yeon Tae JeongAbstract:In the crystal structure, the title compound, C22H25NO3, exists in a twin-chair conformation with equatorial orientations of the meta-methoxyphenyl Groups on both sides of the Secondary Amino Group. The title compound is a positional isomer of 2,4-bis(2-methoxyphenyl)-3-azabicyclo[3.3.1]nonan-9-one and 2,4-bis(4-methoxyphenyl)-3-azabicyclo[3.3.1]nonan-9-one, which both also exhibit twin-chair conformations with equatorial dispositions of the anisyl rings on both sides of the Secondary Amino Group. In the title compound, the meta-methoxyphenyl rings are orientated at an angle of 25.02 (3)° with respect to each other, whereas in the ortho and para isomers, the anisyl rings are orientated at dihedral angles of 33.86 (3) and 37.43 (4)°, respectively. The crystal packing is dominated by van der Waals interactions and by an intermolecular N—H...O hydrogen bond, whereas in the ortho isomer, an intermolecular N—H...π interaction (H...Cg = 2.75 Å) is found
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2,4-Bis(4-chlorophenyl)-3-azabicyclo[3.3.1]nonan-9-one
Acta Crystallographica Section E Structure Reports Online, 2009Co-Authors: P Parthiban, V Ramkumar, Min Sung Kim, Senthamaraikannan Kabilan, Yeon Tae JeongAbstract:In the molecular structure of the title compound, C20H19Cl2NO, the molecule exists in a twin-chair conformation with equatorial dispositions of the 4-chlorophenyl Groups on both sides of the Secondary Amino Group; the dihedral angle between the aromatic ring planes is 31.33 (3)°. The crystal structure is stabilized by N—H...O interactions, leading to chains of molecules
Yinlin Shao - One of the best experts on this subject based on the ideXlab platform.
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Lanthanide-Catalyzed Reversible Alkynyl Exchange by Carbon—Carbon Single-Bond Cleavage Assisted by a Secondary Amino Group.
ChemInform, 2016Co-Authors: Yinlin Shao, Fangjun Zhang, Jie Zhang, Xigeng ZhouAbstract:Lanthanide-catalyzed alkynyl exchange through C—C single-bond cleavage assisted by a Secondary Amino Group is reported.
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lanthanide catalyzed reversible alkynyl exchange by carbon carbon single bond cleavage assisted by a Secondary Amino Group
ChemInform, 2016Co-Authors: Yinlin Shao, Fangjun Zhang, Jie Zhang, Xigeng ZhouAbstract:Lanthanide-catalyzed alkynyl exchange through C—C single-bond cleavage assisted by a Secondary Amino Group is reported.
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lanthanide catalyzed reversible alkynyl exchange by carbon carbon single bond cleavage assisted by a Secondary Amino Group
Angewandte Chemie, 2016Co-Authors: Yinlin Shao, Fangjun Zhang, Jie Zhang, Xigeng ZhouAbstract:Lanthanide-catalyzed alkynyl exchange through C−C single-bond cleavage assisted by a Secondary Amino Group is reported. A lanthanide amido complex is proposed as a key intermediate, which undergoes unprecedented reversible β-alkynyl elimination followed by alkynyl exchange and imine reinsertion. The in situ homo- and cross-dimerization of the liberated alkyne can serve as an additional driving force to shift the metathesis equilibrium to completion. This reaction is formally complementary to conventional alkyne metathesis and allows the selective transformation of internal propargylamines into those bearing different substituents on the alkyne terminus in moderate to excellent yields under operationally simple reaction conditions.
Aleš Růžička - One of the best experts on this subject based on the ideXlab platform.
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Vanadocene complexes of Amino acids containing Secondary Amino Group: the first evidence of O,O-bonded carboxylic Group to vanadocene(IV) moiety.
Journal of inorganic biochemistry, 2010Co-Authors: Jaromír Vinklárek, Tereza Dědourková, Jan Honzíček, Aleš RůžičkaAbstract:Reaction of vanadocene dichlorides (Cp(2)VCl(2) and (eta(5)-C(5)H(4)Me)(2)VCl(2)) with Amino acids containing Secondary Amino Groups gives three types of complexes: a) compounds with N,O-bonded Amino acid, b) O-bonded Amino acids and c) O,O-bonded Amino acid. The complexes with N,O-bonded Amino acid and O-bonded Amino acids were observed in the case of l-proline and N-methylglycine (NMG). Reactions with N-phenylglycine (NPG) give O,O-chelates as the sole products. All three types of the complexes were characterized by spectroscopic methods. Structures of [(eta(5)-C(5)H(4)Me)(2)V(O-Pro)][BPh(4)], [Cp(2)V(O-Pro)(2)][PF(6)](2), [Cp(2)V(N,O-NMG)][BPh(4)].MeOH, [(eta(5)-C(5)H(4)Me)(2)V(N,O-NMG)][BPh(4)].MeOH, [Cp(2)V(O-NMG)(2)][Cl](2).2H(2)O, [(eta(5)-C(5)H(4)Me)(2)V(O-NMG)(2)][Cl](2).H(2)O and [(eta(5)-C(5)H(4)Me)(2)V(O,O-NPG)][BPh(4)] were determined by X-ray crystallography.
P Parthiban - One of the best experts on this subject based on the ideXlab platform.
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2,4-Bis(4-but-oxy-phen-yl)-3-aza-bicyclo-[3.3.1]nonan-9-one.
Acta Crystallographica Section E Structure Reports Online, 2011Co-Authors: P Parthiban, V Ramkumar, Yeon Tae JeongAbstract:In the title compound, C28H37NO3, a crystallographic mirror plane bisects the molecule (one half-molecule in the asymmetric unit). The title compound exists in a twin-chair conformation with an equatorial orientation of the 4-butoxyphenyl Groups. Both sides of the Secondary Amino Group carry the 4-butoxyphenyl Groups at an angle of 38.54 (3)° with respect to one another.
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2,4-Bis(4-chloro-phen-yl)-1-methyl-3-aza-bicyclo-[3.3.1]nonan-9-one.
Acta crystallographica. Section E Structure reports online, 2010Co-Authors: P Parthiban, V Ramkumar, Yeon Tae JeongAbstract:The title compound, C(21)H(21)Cl(2)NO, exists in a twin-chair conformation with an equatorial orientation of the 4-chloro-phenyl Groups on both sides of the Secondary Amino Group; the dihedral angle between the 4-chloro-phenyl rings is 36.58 (2)°. The crystal packing is stabilized by an inter-molecular N-H⋯O hydrogen bond and a weak Cl⋯Cl [3.4331 (9) Å] inter-action.
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2,4-Bis(3-methoxy-phen-yl)-3-aza-bicyclo-[3.3.1]nonan-9-one.
Acta crystallographica. Section E Structure reports online, 2009Co-Authors: P Parthiban, V Ramkumar, Yeon Tae JeongAbstract:In the crystal structure, the title compound, C(22)H(25)NO(3), exists in a twin-chair conformation with equatorial orientations of the meta-methoxy-phenyl Groups on both sides of the Secondary Amino Group. The title compound is a positional isomer of 2,4-bis-(2-methoxy-phen-yl)-3-aza-bicyclo-[3.3.1]nonan-9-one and 2,4-bis-(4-methoxy-phen-yl)-3-aza-bicyclo-[3.3.1]nonan-9-one, which both also exhibit twin-chair conformations with equatorial dispositions of the anisyl rings on both sides of the Secondary Amino Group. In the title compound, the meta-methoxy-phenyl rings are orientated at an angle of 25.02 (3)° with respect to each other, whereas in the ortho and para isomers, the anisyl rings are orientated at dihedral angles of 33.86 (3) and 37.43 (4)°, respectively. The crystal packing is dominated by van der Waals inter-actions and by an inter-molecular N-H⋯O hydrogen bond, whereas in the ortho isomer, an inter-molecular N-H⋯π inter-action (H⋯Cg = 2.75 Å) is found.
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2,4-Bis(3-methoxyphenyl)-3-azabicyclo[3.3.1]nonan-9-one
Acta Crystallographica Section E Structure Reports Online, 2009Co-Authors: P Parthiban, V Ramkumar, Yeon Tae JeongAbstract:In the crystal structure, the title compound, C22H25NO3, exists in a twin-chair conformation with equatorial orientations of the meta-methoxyphenyl Groups on both sides of the Secondary Amino Group. The title compound is a positional isomer of 2,4-bis(2-methoxyphenyl)-3-azabicyclo[3.3.1]nonan-9-one and 2,4-bis(4-methoxyphenyl)-3-azabicyclo[3.3.1]nonan-9-one, which both also exhibit twin-chair conformations with equatorial dispositions of the anisyl rings on both sides of the Secondary Amino Group. In the title compound, the meta-methoxyphenyl rings are orientated at an angle of 25.02 (3)° with respect to each other, whereas in the ortho and para isomers, the anisyl rings are orientated at dihedral angles of 33.86 (3) and 37.43 (4)°, respectively. The crystal packing is dominated by van der Waals interactions and by an intermolecular N—H...O hydrogen bond, whereas in the ortho isomer, an intermolecular N—H...π interaction (H...Cg = 2.75 Å) is found
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2,4-Bis(4-chlorophenyl)-3-azabicyclo[3.3.1]nonan-9-one
Acta Crystallographica Section E Structure Reports Online, 2009Co-Authors: P Parthiban, V Ramkumar, Min Sung Kim, Senthamaraikannan Kabilan, Yeon Tae JeongAbstract:In the molecular structure of the title compound, C20H19Cl2NO, the molecule exists in a twin-chair conformation with equatorial dispositions of the 4-chlorophenyl Groups on both sides of the Secondary Amino Group; the dihedral angle between the aromatic ring planes is 31.33 (3)°. The crystal structure is stabilized by N—H...O interactions, leading to chains of molecules