Assignment of Absolute Configuration of Natural Abundance Deuterium Signals Associated with (R)- and (S)-Enantioisotopomers in a Fatty Acid Aligned in a Chiral Liquid Crystal:  Enantioselective Synthesis and NMR Analysis

2006 ◽  
Vol 128 (34) ◽  
pp. 11180-11187 ◽  
Author(s):  
Vincent Baillif ◽  
Richard J. Robins ◽  
Isabelle Billault ◽  
Philippe Lesot
Keyword(s):  
Liquid Crystal ◽  
Fatty Acid ◽  
Absolute Configuration ◽  
Natural Abundance ◽  
Enantioselective Synthesis ◽  
Nmr Analysis ◽  
Chiral Liquid Crystal

Chiral Liquid Crystal Mesogens. Synthesis and Determination of Absolute Configuration of Mesogens with 4,4′-Biphenanthryl Cores

Synlett ◽  
1989 ◽  
Vol 1989 (1) ◽  
pp. 18-19 ◽  
Author(s):  
Kazuo Yamamura ◽  
Satoru Ono ◽  
Hisanobu Ogoshi ◽  
Hideki Masuda ◽  
Yasuhisa Kuroda
Keyword(s):  
Liquid Crystal ◽  
Absolute Configuration ◽  
Chiral Liquid Crystal ◽  
Determination Of Absolute Configuration

Chiral Liquid Crystal Mesogens. Synthesis and Determination of Absolute Configuration of Mesogens with 4,4′-Biphenanthryl Cores

Synlett ◽  
1989 ◽  
Vol 1989 (01) ◽  
pp. 18-19 ◽  
Author(s):  
Kazuo Yamamura ◽  
Satoru Ono ◽  
Hisanobu Ogoshi ◽  
Hideki Masuda ◽  
Yasuhisa Kuroda
Keyword(s):  
Liquid Crystal ◽  
Absolute Configuration ◽  
Chiral Liquid Crystal ◽  
Determination Of Absolute Configuration

Attractive mode force microscopy of chiral liquid crystal surfaces

1992 ◽  
Vol 50 (1) ◽  
pp. 268-269
Author(s):  
B.D. Terris ◽  
R. J. Twieg ◽  
C. Nguyen ◽  
G. Sigaud ◽  
H. T. Nguyen
Keyword(s):  
Liquid Crystal ◽  
Crystal Surfaces ◽  
Free Surfaces ◽  
Control Range ◽  
Force Microscopy ◽  
Liquid Crystal Films ◽  
Chiral Liquid Crystal ◽  
Crystal Films ◽  
Electrostatic Charging ◽  
And Shifts

We have used a force microscope in the attractive, or noncontact, mode to image a variety of surfaces. In this mode, the microscope tip is oscillated near its resonant frequency and shifts in this frequency due to changes in the surface-tip force gradient are detected. We have used this technique in a variety of applications to polymers, including electrostatic charging, phase separation of ionomer surfaces, and crazing of glassy films.Most recently, we have applied the force microscope to imaging the free surfaces of chiral liquid crystal films. The compounds used (Table 1) have been chosen for their polymorphic variety of fluid mesophases, all of which exist within the temperature control range of our force microscope.

Evaluation of Different Synthetic Routes to (2R,3R)-3-Hydroxymethyl-2-(4-hydroxy- 3-methoxyphenyl)-1,4-Benzodioxane-6-Carbaldehyde

2020 ◽  
Vol 23 (26) ◽  
pp. 2960-2968
Author(s):  
Renáta Kertiné Ferenczi ◽  
Tünde-Zita Illyés ◽  
Sándor Balázs Király ◽  
Gyula Hoffka ◽  
László Szilágyi ◽  
...  
Keyword(s):  
Absolute Configuration ◽  
Stereoselective Synthesis ◽  
Cotton Effect ◽  
Enantioselective Synthesis ◽  
Aryl Group ◽  
Target Molecule ◽  
Synthetic Routes ◽  
The Absolute

The reported enantioselective synthesis for the preparation of (+)-(2R,3R)-2-(4- hydroxy-3-methoxyphenyl)-3-hydroxymethyl-1,4-benzodioxane-6-carbaldehyde, precursor for the stereoselective synthesis of bioactive flavanolignans, could not be reproduced. Thus, the target molecule was prepared via the synthesis and separation of diastereomeric O-glucosides. TDDFT-ECD calculations and the 1,4-benzodioxane helicity rule were utilized to determine the absolute configuration. ECD calculations also confirmed that the 1Lb Cotton effect is governed by the helicity of the heteroring, while the higher-energy ECD transitions reflect mainly the orientation of the equatorial C-2 aryl group.

scholarly journals Rapid Organocatalytic Chirality Analysis of Amines, Amino Acids, Alcohols, Amino Alcohols and Diols with Achiral Iso(thio)cyanate Probes

2021 ◽  
Author(s):  
Eryn Nelson ◽  
Jeffrey S. S. K. Formen ◽  
Christian Wolf
Keyword(s):  
Amino Acids ◽  
Absolute Configuration ◽  
Rapid Determination ◽  
Amino Alcohols ◽  
Enantioselective Synthesis ◽  
Widespread Occurrence ◽  
Chiral Compounds ◽  
New Methods ◽  
The Absolute

The widespread occurrence and significance of chiral compounds does not only require new methods for their enantioselective synthesis but also efficient tools that allow rapid determination of the absolute configuration,...

Effects of Gold Nanoparticle Dispersion in a Chiral Liquid Crystal Matrix

2013 ◽  
Vol 572 (1) ◽  
pp. 59-65 ◽  
Author(s):  
M. Infusino ◽  
A. De Luca ◽  
F. Ciuchi ◽  
A. Ionescu ◽  
N. Scaramuzza ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Gold Nanoparticle ◽  
Nanoparticle Dispersion ◽  
Crystal Matrix ◽  
Chiral Liquid Crystal ◽  
Liquid Crystal Matrix

Chiral Liquid Crystal Trimer Exhibiting an Optically Uniaxial Smectic Phase with a Double-Peak Polarization

2012 ◽  
Vol 116 (15) ◽  
pp. 8678-8687 ◽  
Author(s):  
Daiki Tsuji ◽  
Yoichi Takanishi ◽  
Jun Yamamoto ◽  
Atsushi Yoshizawa
Keyword(s):  
Liquid Crystal ◽  
Smectic Phase ◽  
Double Peak ◽  
Chiral Liquid Crystal
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