Synthesis and Rotational Isomerism of 1-Substituted Methyl (S)-[5-(2-Nitrophenyl)-1H-pyrazole-4-carbonyl]alaninates

2015 ◽  
Vol 81 (1) ◽  
pp. 146-161 ◽  
Author(s):  
Luka Šenica ◽  
Karmen Stopar ◽  
Miha Friedrich ◽  
Uroš Grošelj ◽  
Janez Plavec ◽  
...  
Keyword(s):  
Rotational Isomerism

Infrared studies on rotational isomerism. III. 2-Chloro- and 2-bromo-ethanol

1969 ◽  
Vol 47 (6) ◽  
pp. 901-910 ◽  
Author(s):  
Paul Buckley ◽  
Paul A. Giguère ◽  
Michel Schneider
Keyword(s):  
Hydrogen Bonding ◽  
Intramolecular Hydrogen Bonding ◽  
Rotational Isomerism ◽  
Apparent Discrepancy ◽  
Trans Isomers ◽  
Kcal Mole ◽  
Infrared Studies ◽  
Isotopic Molecule ◽  
Intramolecular Hydrogen ◽  
Unambiguous Assignment

The relative intensities of the C—X stretching bands of the gauche and trans isomers in the vapor were measured as a function of temperature up to 165 °C for 2-chloroethanol, and up to 130 °C for 2-bromoethanol. From these the enthalpy differences between the two isomers were found to be 1.20 and 1.45 ± 0.1 kcal mole−1 respectively for the two halogenated ethanols. Similar measurements on the O—H stretching bands gave values higher than the above by 0.45 kcal mole−1 for both compounds. This apparent discrepancy is interpreted as due to a second gauche isomer, the OH group of which is not engaged in intramolecular hydrogen bonding, and which is less stable than the trans isomer.A study of the isotopic molecule ClCH2—CH2OD has led to unambiguous assignment of the OH bending and torsional frequencies. The spectra of the solid show that 2-chloroethanol can exist in two different crystalline phases: a stable one consisting of gauche molecules only, and a metastable one containing both isomers.

Rotational isomerism of chloroacetone: Solvent effect

1990 ◽  
Vol 46 ◽  
pp. 75-81 ◽  
Author(s):  
M.I. Redonido ◽  
M.V. Garcia
Keyword(s):  
Solvent Effect ◽  
Rotational Isomerism

Vibrational spectra and rotational isomerism of chloroethylgermane

1985 ◽  
Vol 127 (3-4) ◽  
pp. 257-265 ◽  
Author(s):  
Keijiro Taga ◽  
Hirofumi Okabayashi ◽  
Keiichi Ohno ◽  
Hiroatsu Matsuura
Keyword(s):  
Vibrational Spectra ◽  
Rotational Isomerism

Rotational isomerism and calculation of the vibrational spectrum of methyl vinyl selenide

1987 ◽  
Vol 36 (6) ◽  
pp. 1181-1184
Author(s):  
A. N. Surushkin ◽  
L. M. Sinegovskaya ◽  
Yu. L. Frolov ◽  
N. K. Gursarova ◽  
V. A. Potapov ◽  
...  
Keyword(s):  
Vibrational Spectrum ◽  
Rotational Isomerism ◽  
Methyl Vinyl
Sign in / Sign up

Export Citation Format

Share Document