scholarly journals Circular dichroism spectra, optical rotations and absolute configurations ofcis-dihydrodiol metabolites of quinoline and derivatives: The role of the nitrogen atom

Chirality ◽  
2009 ◽  
Vol 21 (1E) ◽  
pp. E37-E47 ◽  
Author(s):  
Marcin Kwit ◽  
Jacek Gawronski ◽  
Lenuta Sbircea ◽  
Narain D. Sharma ◽  
Magdalena Kaik ◽  
...  
Keyword(s):  
Circular Dichroism ◽  
Nitrogen Atom ◽  
Circular Dichroism Spectra ◽  
Optical Rotations ◽  
Circular Dichroïsm

Synthesis and spectroscopic properties of chiral bornane[2,3-b]pyrazino-fused [30]trithiadodecaazahexaphyrins

2014 ◽  
Vol 18 (10n11) ◽  
pp. 1014-1020 ◽  
Author(s):  
Maksim S. Filatov ◽  
Olga N. Trukhina ◽  
M. Salomé Rodríguez-Morgade ◽  
Mikhail K. Islyaikin ◽  
Oscar I. Koifman ◽  
...  
Keyword(s):  
Circular Dichroism ◽  
Spectroscopic Properties ◽  
Mirror Image ◽  
Circular Dichroism Spectra ◽  
Analytical Column ◽  
Optical Rotations ◽  
Circular Dichroïsm ◽  
Identification And Characterization

First chiral bornane[2,3-b]pyrazino-fused [30]trithiadodecaazahexaphyrins were prepared by a crossover condensation of R-(+)- or S-(–)-bornane[2′,3′-b]-2,3-dicyanopyrazine and 2,5-diamino-1,3,4-thiadiazole using two different methods. R-(+)- and S-(–)-enantiomers were characterized by their optical rotations and circular dichroism spectra, showing a mirror image relationship with respect to [θ] = 0. Regioisomers with C1 and C3 symmetry of R-(+)-[30]trithiadodecaazahexaphyrin have been separated using HPLC CHIRALPACK IC analytical column, allowing their unambiguous identification and characterization.

Circular Dichroism and Conformation of Oostatic Peptides: The Carrier-Like Role of C-Terminal Oligoproline Sequence

2003 ◽  
Vol 68 (7) ◽  
pp. 1309-1318 ◽  
Author(s):  
Petr Maloň ◽  
Helena Dlouhá ◽  
Blanka Bennettová ◽  
Richard Tykva ◽  
Jan Hlaváček
Keyword(s):  
Circular Dichroism ◽  
Circular Dichroism Spectra ◽  
Circular Dichroïsm

Circular dichroism spectra of the peptides H-Tyr-Asp-Pro-OH, H-Tyr-Asp-Pro-Ala-OH, H-Tyr-Asp-Pro-Ala-(Pro)n-OH (n = 1-6) and of their two methyleneoxy isosters were measured and analyzed in terms of possible interactions between the N-terminal (mostly tetrapeptide) part that is responsible for the oostatic activity and the C-terminal oligoproline sequence. The results indicate that the two parts are largely independent and that the C-terminal (Pro)n sequence serves another purpose, possibly as a carrier.

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