Helix formation of poly(phenylacetylene) derivatives bearing amino groups at the meta position induced by optically active carboxylic acids

2001 ◽  
Vol 39 (18) ◽  
pp. 3180-3189 ◽  
Author(s):  
Katsuhiro Maeda ◽  
Seiji Okada ◽  
Eiji Yashima ◽  
Yoshio Okamoto
Keyword(s):  
Carboxylic Acids ◽  
Optically Active ◽  
Amino Groups ◽  
Meta Position ◽  
Helix Formation

Perturbation theory of substituent effect. Importance of the field effect in transmission of the substituent effect

1980 ◽  
Vol 45 (6) ◽  
pp. 1655-1661 ◽  
Author(s):  
Robert Ponec
Keyword(s):  
Perturbation Theory ◽  
Carboxylic Acids ◽  
Quantum Chemical ◽  
Substituent Effect ◽  
Field Effect ◽  
Adequate Description ◽  
Meta Position ◽  
Unsaturated Carboxylic Acids

Various quantum chemical approaches to the problem of transmission of the substituent effect were compared. It was shown that inclusion of the electronic repulsion (field effect) was necessary to give a true picture of differences in ρ constants for reactions of the cis and trans isomers of substituted unsaturated carboxylic acids; the same holds for an adequate description of transmission of the substituent effect from the meta position on a given skeleton.

Synthesis and properties of optically active substituted polyacetylenes having carboxyl and/or amino groups

Polymer ◽  
2004 ◽  
Vol 45 (3) ◽  
pp. 849-854 ◽  
Author(s):  
Fumio Sanda ◽  
Yosuke Yukawa ◽  
Toshio Masuda
Keyword(s):  
Optically Active ◽  
Amino Groups

scholarly journals Helix Formation of Poly(phenylacetylene)s Bearing Azide Groups through Click Polymer Reaction with Optically Active Acetylenes

2009 ◽  
Vol 41 (2) ◽  
pp. 108-109 ◽  
Author(s):  
Ken Itomi ◽  
Shinzo Kobayashi ◽  
Kazuhide Morino ◽  
Hiroki Iida ◽  
Eiji Yashima
Keyword(s):  
Optically Active ◽  
Helix Formation ◽  
Polymer Reaction

scholarly journals Chiral carboxylic acids and their effects on melting-point behaviour in co-crystals with isonicotinamide

2008 ◽  
Vol 64 (6) ◽  
pp. 780-790 ◽  
Author(s):  
Andreas Lemmerer ◽  
Nikoletta B. Báthori ◽  
Susan A. Bourne
Keyword(s):  
Melting Point ◽  
Crystal Structures ◽  
Carboxylic Acids ◽  
Optically Active ◽  
Phenylpropionic Acid ◽  
Space Groups ◽  
Two Systems ◽  
Packing Arrangement ◽  
Phenylbutyric Acid

The crystal structures of co-crystals of two systems of chiral carboxylic acids, optically active and racemic 2-phenylpropionic acid and 2-phenylbutyric acid, with isonicotinamide are reported to investigate the effects of the chirality of the chiral carboxylic acids on the melting point of the co-crystal complexes. It was found that the racemic co-crystal has a higher melting point than the optically active co-crystal, which correlates with the denser packing arrangement inherent in centrosymmetric space groups.

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