scholarly journals Crystal Structure of the Isopropylzinc Alkoxide of Pyrimidyl Alkanol: Mechanistic Insights for Asymmetric Autocatalysis with Amplification of Enantiomeric Excess

2015 ◽  
Vol 54 (50) ◽  
pp. 15218-15221 ◽  
Author(s):  
Arimasa Matsumoto ◽  
Takaaki Abe ◽  
Atsushi Hara ◽  
Takayuki Tobita ◽  
Taisuke Sasagawa ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Enantiomeric Excess ◽  
Asymmetric Autocatalysis

scholarly journals Crystal Structure of the Isopropylzinc Alkoxide of Pyrimidyl Alkanol: Mechanistic Insights for Asymmetric Autocatalysis with Amplification of Enantiomeric Excess

2015 ◽  
Vol 127 (50) ◽  
pp. 15433-15436 ◽  
Author(s):  
Arimasa Matsumoto ◽  
Takaaki Abe ◽  
Atsushi Hara ◽  
Takayuki Tobita ◽  
Taisuke Sasagawa ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Enantiomeric Excess ◽  
Asymmetric Autocatalysis

Synthese neuer optisch aktiver Rh-Komplexe: Die Kristallstruktur von [(5S)-3,4-Bis(diphenylphosphino)-5-menthoxy-2(5H)-furanon](1,5-cyclooctadien)rhodium-hexafluorophosphat / Synthesis of New Optically Active Rh-Complexes: The Crystal Structure of [(5S)-3,4-Bis(diphenylphosphino)-5-menthoxy-2(5 H)-furanone](1,5-cyclooctadiene)rhodium-hexafluorophosphate

1989 ◽  
Vol 44 (8) ◽  
pp. 884-888 ◽  
Author(s):  
Dieter Fenske ◽  
Kurt Merzweiler
Keyword(s):  
Crystal Structure ◽  
Methyl Ester ◽  
Single Crystal ◽  
Enantiomeric Excess ◽  
Optically Active ◽  
Monoclinic Space Group ◽  
Space Group ◽  
X Ray ◽  
Lattice Constants

The chiral diphosphine 1 reacts with [(diolefin)Rh(THF)2]PF6 (diolefine: 1.5-cyclooctadiene, norbornadiene) to form the complexes 4 and 5. The structure of 4 was determined by single crystal X-ray analysis. 4 crystallizes in the monoclinic space group P21. The lattice constants (at 180 K) are: a = 974.0(6); b = 3889.2(29); c = 1309.4(5) pm; β = 105.25(4)°. The hydrogenation of methyl-α-acetamidocinnamate in the presence of 5 yields (R)-N-acetylphenylalanine methyl ester with 33% enantiomeric excess.

scholarly journals Rigid and concave, 2,4-cis-substituted azetidine derivatives: A platform for asymmetric catalysis

2018 ◽  
Author(s):  
Akina Yoshizawa ◽  
Antonio Feula ◽  
Louise Male ◽  
Andrew G. Leach ◽  
John Fossey
Keyword(s):  
Crystal Structure ◽  
Single Crystal ◽  
Asymmetric Catalysis ◽  
Enantiomeric Excess ◽  
Platinum Complex ◽  
Crystal Structure Analysis ◽  
Single Crystal Structure ◽  
Complex Catalyst ◽  
Reaction Conditions ◽  
Absolute Stereochemistry

A series of single enantiomer, 2,4-<i>cis</i>-disubstituted amino azetidines were synthesised and used as ligands for copper-catalysed Henry reactions of aldehydes with nitromethane. Optimisation of ligand substituents and the reaction conditions was conducted. The enantiomeric excess of the formed products was highest when alkyl aldehydes were employed in the reaction (>99% e.e.). The absolute stereochemistry of one representative azetidine derivative salt was determined by analysis of the Flack parameter of an XRD single crystal structure. The origin of selectivity in catalysis was investigated computationally, revealing the importance of the amino-substituent in determining the stereochemical outcome. A racemic platinum complex of a <i>cis</i>-disubstituted azetidine is examined by XRD single crystal structure analysis with reference to its steric parameters, and analogies to the computationally determined copper complex catalyst are drawn.<br>

Asymmetric autocatalysis of 5-carbamoyl-3-pyridyl alkanols with amplification of enantiomeric excess

2000 ◽  
Vol 11 (21) ◽  
pp. 4249-4253 ◽  
Author(s):  
Shigehisa Tanji ◽  
Yasutaka Kodaka ◽  
Atsushi Ohno ◽  
Takanori Shibata ◽  
Itaru Sato ◽  
...  
Keyword(s):  
Enantiomeric Excess ◽  
Asymmetric Autocatalysis

Self-Replication and Amplification of Enantiomeric Excess of Chiral Multifunctionalized Large Molecules by Asymmetric Autocatalysis

2014 ◽  
Vol 53 (42) ◽  
pp. 11199-11202 ◽  
Author(s):  
Tsuneomi Kawasaki ◽  
Mai Nakaoda ◽  
Yutaro Takahashi ◽  
Yusuke Kanto ◽  
Nanako Kuruhara ◽  
...  
Keyword(s):  
Enantiomeric Excess ◽  
Large Molecules ◽  
Asymmetric Autocatalysis ◽  
Self Replication

scholarly journals Asymmetric autocatalysis triggered by triglycine sulfate with switchable chirality by the direction of electric field

2021 ◽  
Author(s):  
Tsuneomi Kawasaki ◽  
Yoshiyasu Kaimori ◽  
Seiya Shimada ◽  
Natsuki Hara ◽  
Susumu Sato ◽  
...  
Keyword(s):  
Electric Field ◽  
Organic Compounds ◽  
Enantiomeric Excess ◽  
Triglycine Sulfate ◽  
Molecular Chirality ◽  
Asymmetric Autocatalysis ◽  
Soai Reaction

Triglycine sulfate (TGS) acts as a chiral trigger for asymmetric autocatalysis with amplification of enantiomeric excess, i.e., the Soai reaction. Therefore, molecular chirality of highly enantioenriched organic compounds is controlled...

ChemInform Abstract: Asymmetric Autocatalysis of 5-Carbamoyl-3-pyridyl Alkanols with Amplification of Enantiomeric Excess.

ChemInform ◽  
2001 ◽  
Vol 32 (14) ◽  
pp. no-no
Author(s):  
Shigehisa Tanji ◽  
Yasutaka Kodaka ◽  
Atsushi Ohno ◽  
Takanori Shibata ◽  
Itaru Sato ◽  
...  
Keyword(s):  
Enantiomeric Excess ◽  
Asymmetric Autocatalysis

Relationship between the time, yield, and enantiomeric excess of asymmetric autocatalysis of chiral 2-alkynyl-5-pyrimidyl alkanol with amplification of enantiomeric excess

2003 ◽  
Vol 14 (8) ◽  
pp. 975-979 ◽  
Author(s):  
Itaru Sato ◽  
Daisuke Omiya ◽  
Hiroyoshi Igarashi ◽  
Keiichi Kato ◽  
Yoshihiro Ogi ◽  
...  
Keyword(s):  
Enantiomeric Excess ◽  
Asymmetric Autocatalysis
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