Optical rotatory dispersion studies. 134. Absolute configuration and circular dichroism spectrum of (R)-[2-2H1]cyclopentanone. Demonstration of a conformational isotope effect

1981 ◽  
Vol 103 (17) ◽  
pp. 5004-5007 ◽  
Author(s):  
P. Sundararaman ◽  
Guenter Barth ◽  
Carl Djerassi
Keyword(s):  
Circular Dichroism ◽  
Isotope Effect ◽  
Absolute Configuration ◽  
Circular Dichroism Spectrum ◽  
Optical Rotatory Dispersion ◽  
Rotatory Dispersion ◽  
Optical Rotatory ◽  
Circular Dichroïsm

Optically Active Trialkynyl(phenyl)methane: Synthesis and Determination of Its Absolute Configuration by Vibrational Circular Dichroism (VCD) and Optical Rotatory Dispersion (ORD)

2010 ◽  
Vol 2010 (13) ◽  
pp. 2452-2456 ◽  
Author(s):  
Boris Buschhaus ◽  
Vito Convertino ◽  
Pablo Rivera-Fuentes ◽  
José Lorenzo Alonso-Gómez ◽  
Ana G. Petrovic ◽  
...  
Keyword(s):  
Circular Dichroism ◽  
Absolute Configuration ◽  
Optically Active ◽  
Vibrational Circular Dichroism ◽  
Optical Rotatory Dispersion ◽  
Rotatory Dispersion ◽  
Optical Rotatory ◽  
Circular Dichroïsm

Optical rotatory dispersion and circular dichroism of diastereoisomers. I. The ephedrines and chloramphenicols

1969 ◽  
Vol 47 (11) ◽  
pp. 1957-1963 ◽  
Author(s):  
L. A. Mitscher ◽  
F. Kautz ◽  
J. LaPidus
Keyword(s):  
Circular Dichroism ◽  
Absorption Band ◽  
Absolute Configuration ◽  
Cotton Effect ◽  
Optical Rotatory Dispersion ◽  
Rotatory Dispersion ◽  
Optical Rotatory ◽  
Apparent Correlation ◽  
Circular Dichroïsm ◽  
Erroneous Assignment

Optical rotatory dispersion (o.r.d.) and circular dichroism measurements are reported for all four diastereoisomers in both the ephedrine and chloramphenicol series. The Cotton effect associated with the 1Lb absorption band is a reliable guide to absolute configuration in both series whereas the 1La band is not. Circular dichroism measurements are preferred as the 1La band dominates the o.r.d. curves to such an extent that erroneous assignment is quite possible. An attempt to relate the sign and intensity of the 1Lb Cotton effect with rotamer population failed due to lack of apparent correlation.

scholarly journals The absolute configuration of cryptopleurine and tylocrebrine

1978 ◽  
Vol 31 (9) ◽  
pp. 2095 ◽  
Author(s):  
E Gellert ◽  
R Rudzats ◽  
JC Craig ◽  
SK Roy ◽  
RW Woodard
Keyword(s):  
Circular Dichroism ◽  
Absolute Configuration ◽  
Optical Rotatory Dispersion ◽  
Rotatory Dispersion ◽  
Optical Rotatory ◽  
Circular Dichroism Spectra ◽  
The Absolute ◽  
Circular Dichroïsm

The absolute configurations of cryptopleurine and (-)-tylocrebrine have been established as R and S respectively by comparison of their optical rotatory dispersion and circular dichroism spectra with those of tylophorine.

scholarly journals Assignment Through Chiroptical Methods of The Absolute Configuration of Fungal Dihydropyranpyran-4-5-Diones Phytotoxins, Potential Herbicides for Buffelgrass (Cenchrus ciliaris) Biocontrol

Molecules ◽  
2019 ◽  
Vol 24 (17) ◽  
pp. 3022 ◽  
Author(s):  
Ernesto Santoro ◽  
Giuseppe Mazzeo ◽  
Giulia Marsico ◽  
Marco Masi ◽  
Giovanna Longhi ◽  
...  
Keyword(s):  
Circular Dichroism ◽  
Computational Methods ◽  
Absolute Configuration ◽  
Vibrational Circular Dichroism ◽  
Optical Rotatory Dispersion ◽  
Rotatory Dispersion ◽  
Optical Rotatory ◽  
Cenchrus Ciliaris ◽  
The Absolute ◽  
Circular Dichroïsm

Radicinin and cochliotoxin (1 and 2) two phytotoxic pyranpyran-4,5-diones were isolated together with their close metabolites 3-epi-radicinin, radicinol, and its 3-epimer (3–5), from the culture filtrates of Cochliobolus australiensis, a fungus proposed as mycoherbcide for biocontrol of buffelgrass, a very noxious and dangerous weed. The absolute configuration of cochliotoxin was determined by chiroptical Optical Rotatory Dispersion (ORD), Electronic Circular Dichroism (ECD), and Vibrational Circular Dichroism (VCD)) and computational methods. The same methods were used to confirm that of radicinin, radicinol and their 3-epimers, previously determined with chemical, spectroscopic and ECD methods.

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