Absolute stereochemistry of (+)-1,8a-dihydro-3,8-dimethylazulene, a labile biosynthetic intermediate for 1,4-dimethylazulene. Determination by theoretical calculation of CD spectra and verification by synthesis of model compounds

1985 ◽  
Vol 107 (2) ◽  
pp. 423-428 ◽  
Author(s):  
Nobuyuki Harada ◽  
Jun Kohori ◽  
Hisashi Uda ◽  
Koji Nakanishi ◽  
Reiji Takeda
Keyword(s):  
Theoretical Calculation ◽  
Cd Spectra ◽  
Model Compounds ◽  
Absolute Stereochemistry

ChemInform Abstract: Absolute Stereostructure of Novel Chiral Troponoid Spiro Compounds as Determined by Theoretical Calculation of CD Spectra.

ChemInform ◽  
1987 ◽  
Vol 18 (30) ◽  
Author(s):  
N. HARADA ◽  
H. UDA ◽  
T. NOZOE ◽  
Y. OKAMOTO ◽  
H. WAKABAYASHI ◽  
...  
Keyword(s):  
Theoretical Calculation ◽  
Spiro Compounds ◽  
Cd Spectra

Sterically Crowded Heterocycles. XIII. An Insight Into the Absolute Stereochemistry of Atropisomeric (Z)-3-(Imidazo[1,2-a]pyridin-3-yl)prop-2-en-1-ones

2000 ◽  
Vol 65 (10) ◽  
pp. 1643-1652
Author(s):  
Radek Pohl ◽  
Jan Sýkora ◽  
Petr Maloň ◽  
Stanislav Böhm ◽  
Bohumil Kratochvíl ◽  
...  
Keyword(s):  
Absolute Configuration ◽  
Heats Of Formation ◽  
Cd Spectra ◽  
X Ray ◽  
Space Analysis ◽  
The Absolute ◽  
Absolute Stereochemistry ◽  
Insight Into

The absolute configuration of the atropisomeric (Z)-3-(5-methyl-2-phenylimidazo[1,2-a]pyridin-3-yl)-1,3-diphenylprop-2-en-1-one was evaluated to be R for the dextrorotatory and S for the laevorotatory enantiomers. The assignment is based on their two-step syntheses via atropodiastereoisomeric carbamates prepared from the corresponding atropodiastereoisomeric alcohols with (R)-(+)-α-phenylethyl isocyanate and by a complete X-ray space analysis of the quaternary triiodide obtained from the (R)-(+)-enantiomer. CD spectra and PM3 calculated heats of formation for selected compounds are discussed in relation to the found molecular configurations.

Syntheses and circular dichroism (CD) spectra of optically active polyoxazolines and their model compounds

1992 ◽  
Vol 25 (23) ◽  
pp. 6322-6331 ◽  
Author(s):  
Yeong Soo Oh ◽  
Toshimasa Yamazaki ◽  
Murray Goodman
Keyword(s):  
Circular Dichroism ◽  
Optically Active ◽  
Cd Spectra ◽  
Model Compounds ◽  
Circular Dichroïsm
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