Chemoenzymatic Approach to Optically Active 4-Hydroxy-5-alkylcyclopent-2-en-1-one Derivatives: An Application of a Combined Circular Dichroism Spectroscopy and DFT Calculations to Assignment of Absolute Configuration

Chirality ◽  
2014 ◽  
Vol 26 (6) ◽  
pp. 300-306 ◽  
Author(s):  
Jadwiga Frelek ◽  
Michał Karchier ◽  
Daria Madej ◽  
Karol Michalak ◽  
Paweł Różański ◽  
...  
Keyword(s):  
Circular Dichroism ◽  
Dft Calculations ◽  
Absolute Configuration ◽  
Circular Dichroism Spectroscopy ◽  
Optically Active ◽  
Circular Dichroïsm

Synthesis and circular dichroism characterization of new optically active transition metal complexes:M[(-)bdtp]3, M = Co3+, Rh3+, Ir3+

1991 ◽  
Vol 56 (12) ◽  
pp. 3006-3011 ◽  
Author(s):  
Paolo Biscarini
Keyword(s):  
Circular Dichroism ◽  
Transition Metal ◽  
Absolute Configuration ◽  
Circular Dichroism Spectroscopy ◽  
Optically Active ◽  
Metal Centre ◽  
Formation Reaction ◽  
Active Transition ◽  
Circular Dichroïsm

The chiral octahedral diastereoisomeric tris[(-)cyclic O,O’,1(R),2(R)(-)dimethylethylene dithiophosphato]metal(III) complexes, M[(-)bdtp]3, M(III) = Co, Rh, Ir, have been obtained stereoselectively in the Λ or Δ absolute configuration at the metal centre. The formation reaction and the characterization of the obtained complexes have been followed by circular dichroism spectroscopy. The complexes prove optically labile in various solvents. A configuration inversion has been observed in all complexes giving diastereoisomeric equilibria Λ(R,R)(R,R)(R,R) = Δ(R,R)(R,R)(R,R) with an excess of one form, occasionally stabilized by the solvent.

Enantiopure methoxetamine stereoisomers: chiral resolution, conformational analysis, UV-circular dichroism spectroscopy and electronic circular dichroism

2021 ◽  
Author(s):  
Kun Won Lee ◽  
Ahmed H. E. Hassan ◽  
Youngdo Jeong ◽  
Seolmin Yoon ◽  
Seung-Hwan Kim ◽  
...  
Keyword(s):  
Circular Dichroism ◽  
Conformational Analysis ◽  
Absolute Configuration ◽  
Circular Dichroism Spectroscopy ◽  
Chiral Resolution ◽  
Treatment Resistant Depression ◽  
Treatment Resistant ◽  
Electronic Circular Dichroism ◽  
Resistant Depression ◽  
Circular Dichroïsm

Enantioseparation and assignment of absolute configuration of methoxetamine (MXE) enantiopure stereoisomers; a promising novel antidepressant for management of treatment-resistant depression.

Absolute Configuration of Sargaol Acetate Using DFT Calculations and Vibrational Circular Dichroism

Heterocycles ◽  
2010 ◽  
Vol 81 (3) ◽  
pp. 625 ◽  
Author(s):  
Pedro Joseph-Nathan ◽  
Marcelo A. Muñoz ◽  
Carlos Areche ◽  
Juana Rovirosa ◽  
Aurelio San-Martín
Keyword(s):  
Circular Dichroism ◽  
Dft Calculations ◽  
Absolute Configuration ◽  
Vibrational Circular Dichroism ◽  
Circular Dichroïsm

scholarly journals Flowers in Australia: Phytochemical Studies on the Illawarra Flame Tree and Alstonville

2016 ◽  
Vol 69 (8) ◽  
pp. 925 ◽  
Author(s):  
Rudi Hendra ◽  
Paul A. Keller
Keyword(s):  
Circular Dichroism ◽  
Methyl Ester ◽  
Secondary Metabolites ◽  
Absolute Configuration ◽  
Circular Dichroism Spectroscopy ◽  
Purple Colour ◽  
Traditional Uses ◽  
Phytochemical Studies ◽  
First Time ◽  
Circular Dichroïsm

The first reported phytochemical studies on two species of flowers in Australia enabled the identification of six secondary metabolites from Illawarra flame tree flower (Brachychiton acerifolius) and seven secondary metabolites from the flowers of the Alstonville (Tibouchina lepidota). Pelargonidin 3-(6-coumarylglucoside)-5-(6-acetylglucoside) was found to be responsible for the red colour of B. acerifolius, whereas malvidin 3-(coumarylglucoside)-5-(acetylxyloside) was responsible for the purple colour of (T. lepidota) flowers. (2S)-4,5-Dihydroxyflavanone 7-O-β-d-glucuronide methyl ester was isolated for the first time from B. acerifolius, and its absolute configuration was determined by circular dichroism spectroscopy. Some of the traditional uses of B. acerifolius could also be correlated with the known activity of the isolated metabolites.

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