Pyrene-Fused [7]Helicenes Connected Via Hexagonal and Heptagonal Rings: Stereospecific Synthesis and Chiroptical Properties

2022 ◽  
Author(s):  
Asim Kumar Swain ◽  
Krzysztof Radacki ◽  
Holger Braunschweig ◽  
Prince Ravat
Keyword(s):  
Stereospecific Synthesis ◽  
Chiroptical Properties

(3R)-5-Azatricyclo[4.3.1.03,8]decan-4-one, a lactam with a non-planar cis-amide group: Synthesis, geometry and chiroptical properties

1984 ◽  
Vol 49 (4) ◽  
pp. 834-839 ◽  
Author(s):  
Miloš Tichý ◽  
Ahmed M. Farag ◽  
Petr Maloň ◽  
Petr Kálal ◽  
Karel Bláha
Keyword(s):  
Carboxylic Acid ◽  
Structure Determination ◽  
Theoretical Calculations ◽  
Amide Group ◽  
Stereospecific Synthesis ◽  
Chiroptical Properties ◽  
X Ray ◽  
Cd Spectrum ◽  
Rotational Strength

Stereospecific synthesis of the title lactam (+)-I starting from (1R,5R,6R)-3-oxobicyclo[3.2.1]-octane-6-carboxylic acid is described. X-Ray structure determination has shown a marked non-planarityof the amide group in I. In accord with theoretical calculations, CD spectrum of the studied (+)-(3R)-enantiomer exhibits a positive n-π and negative π-π band. The rotational strength of the n-π transition is three times higher than that of the π-π transition, contrary to the behaviour of lactams with virtually planar amide groups.

3,4-Seco-3,28-lupanedioic acids substituted in the side chain at C(5)

1980 ◽  
Vol 45 (7) ◽  
pp. 1964-1973 ◽  
Author(s):  
Irena Valterová ◽  
Jiří Klinot ◽  
Alois Vystrčil
Keyword(s):  
Hydrogen Bond ◽  
Intramolecular Hydrogen Bond ◽  
Functional Group ◽  
Stereospecific Synthesis ◽  
Side Chain ◽  
Dioic Acid ◽  
Chiroptical Properties ◽  
Intramolecular Hydrogen ◽  
Derivatives Of

A series of derivatives of 3,4-secolupane-3,28-dioic acid (II-XIV, XIX-XXI) containing an oxygen-containing functional group in the side chain at C(5) was prepared from nitrile I and ketone XVII. In the case of derivatives III-XIV both series of C(4)-epimers, a and b, were obtained. The configuration at C(4) was derived on the basis of the formation of an intramolecular hydrogen bond in compounds IX and XIII from the chiroptical properties of benzoates VII and it was confirmed by a stereospecific synthesis of the 4S-derivative XIIIa from 24-nor-ketone XV.

Stereospecific Synthesis of m-Hydroxymexiletine Enantiomers

2013 ◽  
Vol 6 (3) ◽  
pp. 182-186 ◽  
Author(s):  
Alessia Catalano ◽  
Alessia Carocci ◽  
Giovanni Lentini ◽  
Ivana Defrenza ◽  
Claudio Bruno ◽  
...  
Keyword(s):  
Stereospecific Synthesis

Chiroptical properties of derivatives of L-altruronic acid

1978 ◽  
Vol 43 (8) ◽  
pp. 2062-2067
Author(s):  
Slavomír Bystrický ◽  
Tibor Sticzay ◽  
Pavol Kováč
Keyword(s):  
Chiroptical Properties ◽  
Derivatives Of

Chiroptical properties of morphinan derivatives

1975 ◽  
Vol 40 (3) ◽  
pp. 670-680 ◽  
Author(s):  
R. Bognár ◽  
Gy. Gaál ◽  
P. Kerekes ◽  
A. Lévai ◽  
S. Makleit ◽  
...  
Keyword(s):  
Chiroptical Properties

ChemInform Abstract: Synthesis and Chiroptical Properties of Fullerene Derivatives

ChemInform ◽  
2010 ◽  
Vol 28 (37) ◽  
pp. no-no
Author(s):  
A. BIANCO ◽  
M. MAGGINI ◽  
F. NOVELLO ◽  
C. TONIOLO ◽  
G. SCORRANO ◽  
...  
Keyword(s):  
Chiroptical Properties ◽  
Fullerene Derivatives

Stereospecific synthesis of functionalized cyclopentanes

1989 ◽  
Vol 30 (42) ◽  
pp. 5803-5806 ◽  
Author(s):  
Alfred Hassner ◽  
Rakesh Maurya
Keyword(s):  
Stereospecific Synthesis
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