ChemInform Abstract: Determination of Absolute Configurations and Conformations by Semiempirical Calculation of CD Spectra

ChemInform ◽  
2010 ◽  
Vol 33 (48) ◽  
pp. no-no
Author(s):  
Jan Sandstrom
Keyword(s):  
Semiempirical Calculation ◽  
Cd Spectra

Preparation, spectral properties and biological activities of 5-bromo-6-methyl-2'-deoxyuridine and 5-iodo-6-methyl-2'-deoxyuridine

1980 ◽  
Vol 45 (8) ◽  
pp. 2364-2370 ◽  
Author(s):  
Antonín Holý ◽  
Erik De Clercq
Keyword(s):  
Antiviral Activity ◽  
Spectral Properties ◽  
De Novo ◽  
Biological Activities ◽  
Rabbit Kidney ◽  
Kidney Cells ◽  
Cd Spectra ◽  
Methyl Derivatives ◽  
Primary Rabbit

Reaction of 3',5'-di-O-benzoyl-6-methyl-2'-deoxyuridine (IIa) with elementary bromine or iodine afforded 5-halogeno derivatives IIc and IId which on methanolysis gave 5-bromo-6-methyl-2'-deoxyurine (Ic) and 5-iodo-6-methyl-2'-deoxyurine (Id), respectively. The CD spectra of Ic, Id and 6-methyl-2'-deoxyuridine (Ia) are compared and discussed with regard to determination of the nucleoside conformation. Unlike 5-bromo- and 5-iodo-2'-deoxyuridine, the 6-methyl derivatives Ic and Id exhibit neither antibacterial nor antiviral activity. Nor do they exert any antimetabolic effect on the de novo DNA synthesis in primary rabbit kidney cells.

Enzymatic Synthesis of Four Stereoisomers of 7-0xo-biopterin and Determination of the Absolute Structure of Ichthyopterin

Pteridines ◽  
1990 ◽  
Vol 2 (3) ◽  
pp. 151-156 ◽  
Author(s):  
Shin Ichiro Takikawa ◽  
Sadao Matsuura
Keyword(s):  
Enzymatic Synthesis ◽  
Side Chain ◽  
Side Chains ◽  
Enzymatic Conversion ◽  
Cd Spectra ◽  
The Absolute ◽  
Chiral Centers ◽  
Absolute Structure

Summary Enzymatic conversion of stereoisomers of biopterin (3a-d) to the 7-oxo-biopterin isomers (4a-d) was performed with a new pterin 7-oxidase extracted from carp skin. The chiral centers of the 6-side chains of biopterin isomers were preserved during the conversion, and the four possible stereoisomers of 7-oxo-biopterin (4a-d) were obtained from the corresponding biopterin isomers (3a-d). HPLC and CD spectra studies showed that natural ichthyopterin is 2-amino-6-(L-erythro-1',2' -dihydroxypropyl)-4, 7(3H,8H)-pteridinedione (4a) which has the same L-erythro structure at the side chain as natural biopterin (3a). This fact suggests that ichthyopterin is biologically derived from biopterin in these fishes.

ChemInform Abstract: LASER PHOTOCHEMISTRY PART 2, DETERMINATION OF THE ORD AND CD SPECTRA OF SOME CHROMIUM(III) BETA-DIKETONATES

1975 ◽  
Vol 6 (27) ◽  
pp. no-no
Author(s):  
HAYAMI YONEDA ◽  
USHIO SAKAGUCHI ◽  
YOSHIAKI NAKASHIMA
Keyword(s):  
Cd Spectra

Application of transmission ellipsometry to the determination of CD spectra of porphyrin J-aggregates solid-state samples

2008 ◽  
Vol 205 (4) ◽  
pp. 797-801 ◽  
Author(s):  
O. Arteaga ◽  
Z. El-Hachemi ◽  
A. Canillas
Keyword(s):  
Solid State ◽  
Cd Spectra ◽  
J Aggregates

Molecular Structure of cis- and trans-Tergurides

1998 ◽  
Vol 63 (3) ◽  
pp. 425-433 ◽  
Author(s):  
Michal Hušák ◽  
Bohumil Kratochvíl ◽  
Petr Sedmera ◽  
Vladimír Havlíček ◽  
Hana Votavová ◽  
...  
Keyword(s):  
Molecular Structure ◽  
Crystal Structure ◽  
Absolute Configuration ◽  
Catalytic Hydrogenation ◽  
Ergot Alkaloid ◽  
Cd Spectra ◽  
X Ray ◽  
Relative Stereochemistry ◽  
Cis And Trans

Four isomers of terguride, a semisynthetic ergot alkaloid derivative, have been prepared by catalytic hydrogenation of (5R,8S)- and (5S,8S)-lisuride [1,1-diethyl-3-(6-methyl-8-ergolenyl)urea]. Relative stereochemistry of the isomers is based on NMR and CD spectra. Absolute configuration of all the series has been confirmed by the X-ray crystal structure determination of (5R,8S,10S)-terguride 2-bromobenzoate [1,1-diethyl-3-(6-methyl-8-isoergolenyl)urea, cis-dihydrolisuride].

scholarly journals Determination of the absolute stereochemistry of the epoxide of Aoe (2-amino-8-oxo-9,10-epoxydecanoic acid) in Cyl-1 and Cyl-2 by CD spectra.

1986 ◽  
Vol 50 (2) ◽  
pp. 517-518 ◽  
Author(s):  
Akira ISOGAI ◽  
Seiji TAKAYAMA ◽  
Akira HIROTA ◽  
Akinori SUZUKI
Keyword(s):  
Cd Spectra ◽  
The Absolute ◽  
Absolute Stereochemistry
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