scholarly journals Preparation and Spectroscopic Studies of Cobalt(III) Complexes Containing Optically Active Seven-membered Chelate Ligands

1981 ◽  
Vol 54 (10) ◽  
pp. 2947-2955 ◽  
Author(s):  
Masaaki Kojima ◽  
Ken’ichi Morita ◽  
Junnosuke Fujita
Keyword(s):  
Spectroscopic Studies ◽  
Optically Active ◽  
Chelate Ligands

ChemInform Abstract: Synthesis and Spectroscopic Studies of Optically Active N-Acetyl Butenoates and N-Acetyl-2-alkyl-pyrrolin-4-ones.

ChemInform ◽  
2010 ◽  
Vol 33 (27) ◽  
pp. no-no
Author(s):  
Efstathios Gavrielatos ◽  
Giorgos Athanasellis ◽  
Olga Igglessi-Markopoulou
Keyword(s):  
Spectroscopic Studies ◽  
Optically Active

The mechanism of hydrogenation of activated olefins, including prochiral ones, using trans-chlorohydridobis(diop)ruthenium(II)

1980 ◽  
Vol 58 (3) ◽  
pp. 245-250 ◽  
Author(s):  
Brian R. James ◽  
Daniel K. W. Wang
Keyword(s):  
Spectroscopic Studies ◽  
Optically Active ◽  
Title Complex ◽  
Mild Conditions ◽  
Rate Determining Step ◽  
Coordination Sites ◽  
Activated Olefins

Solutions of the title complex trans-HRuCl(diop)2, where diop is an optically active chelating ditertiary, hydrogenate under mild conditions activated olefinic substrates, including prochiral ones in high optical yields. Kinetic and spectroscopic studies on hydrogenation of acrylamide and β-phenylacrylic acid indicate an 'unsaturate' mechanism involving rapid coordination of the substrate to give an alkyl intermediate, that subsequently reacts with H2 in a rate-determining step to yield the saturated product and the starting monohydride complex. A diop ligand dissociates to provide necessary coordination sites at the metal. The α-phenylacrylic acid coordinates more strongly than acrylamide, but hydrogenates more slowly.

Spectroscopic studies on some sulphur-containing amino acid complexes of cobalt, nickel and copper

1974 ◽  
Vol 27 (8) ◽  
pp. 1629 ◽  
Author(s):  
RJ Magee ◽  
W Mazurek ◽  
MJ O'Conner ◽  
AT Phillip
Keyword(s):  
Amino Acids ◽  
Amino Acid ◽  
Structural Analysis ◽  
Energy Level ◽  
Spectroscopic Studies ◽  
Optically Active ◽  
Ligand Field ◽  
Spectral Measurements ◽  
X Ray ◽  
Cobalt Nickel

The synthesis of three potentially sexadentate optically active sulphur-containing amino acids, 2,9- diamino-4,7-dithiadecanedioic acid [(R,R)-ebc], 2,ll-diamino-5,8-dithiadodecanedioic acid [(S,S)- ebhc] and 2,7-di(3'-thiabuty1)-3,6-diazaoctanedioic acid [(S,S)-ebm] are described. Some metal complexes of the acids with cobalt, nickel and copper are characterized by spectroscopic measurements. The complex�� (-)589[Co{(S,S)-ebm}] ClO4 is formed stereospecifically and an X-ray structural analysis shows it to have the Δ-trans(O) configuration. The c.d. spectrum shows the presence of three bands due to the splitting of the T1g energy level by the effective C2 symmetry of the ligand field. Some polymeric cobalt(11) and nickel(11) complexes are also described. Spectral measurements indicate an octahedral coordination of the ligands involved. Several copper(11) complexes are also described.

An Approach to Rigid, Optically Active Chelate Ligands withC2Symmetry: Dialkylhexaphosphapentaprismanes

2013 ◽  
Vol 2013 (33) ◽  
pp. 5769-5780 ◽  
Author(s):  
Christine Höhn ◽  
Irene Keller ◽  
Lars Rohwer ◽  
Frank W. Heinemann ◽  
Ulrich Zenneck
Keyword(s):  
Optically Active ◽  
Chelate Ligands

Thermodynamic and spectroscopic studies on the protonation of an optically active polyampholyte

1989 ◽  
Vol 22 (7) ◽  
pp. 3138-3143 ◽  
Author(s):  
Rolando Barbucci ◽  
Mario Casolaro ◽  
Annalisa Di Tommaso ◽  
Agnese Magnani
Keyword(s):  
Spectroscopic Studies ◽  
Optically Active
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