Infrared spectra and conformation of substituted methyl cyclohexanecarboxylates and 2-hydroxycyclohexanecarboxylates

1979 ◽  
Vol 44 (2) ◽  
pp. 410-419 ◽  
Author(s):  
Soňa Vašíčková ◽  
Miloš Tichý
Keyword(s):  
Carboxylic Acids ◽  
Infrared Spectra ◽  
Conformational Equilibrium ◽  
Hydroxy Acids ◽  
Stretching Vibration ◽  
Integrated Intensities

Infrared bands due to carbonyl and hydroxyl stretching vibration were measured for 32 esters of substituted cyclohexane and trans-decalin carboxylic acids and 2-hydroxy acids. The bands were computer-separated and most of them assigned to the appropriate rotamers. The conformational equilibrium in methyl trans-2-hydroxy-cis-4-isopropylcyclohexanecarboxylate was determined using comparison of integrated intensities of the hydroxyl bands of the mobile compound with those of the conformationally biased standards. The OH/COOCH3 vicinal interaction was found to be attractive (about 2.6 kJ mol-1).

The reaction of carboxylic acids with epoxides using lithium naphthalenide

1974 ◽  
Vol 27 (10) ◽  
pp. 2205 ◽  
Author(s):  
T Fujita ◽  
S Watanabe ◽  
K Suga
Keyword(s):  
Carboxylic Acids ◽  
Good Yield ◽  
Hydroxy Acids

Lithium naphthalenide reacts with carboxylic acids in the presence of diethylamine to give the α-anions of lithium carboxylates. Reaction of these anions with various epoxides gives the corresponding y-hydroxy acids in good yield. The γ-hydroxy acids easily cyclize to give γ-butyrolactones.

Hydration of Simple Carboxylic Acids from Infrared Spectra of HDO and Theoretical Calculations

2011 ◽  
Vol 115 (16) ◽  
pp. 4834-4842 ◽  
Author(s):  
Maciej Śmiechowski ◽  
Emilia Gojło ◽  
Janusz Stangret
Keyword(s):  
Carboxylic Acids ◽  
Infrared Spectra ◽  
Theoretical Calculations

scholarly journals The Messy Alkaline Formose Reaction and Its Link to Metabolism

Life ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 125
Author(s):  
Arthur Omran ◽  
Cesar Menor-Salvan ◽  
Greg Springsteen ◽  
Matthew Pasek
Keyword(s):  
Carboxylic Acids ◽  
Food Source ◽  
Chemical Species ◽  
Origins Of Life ◽  
Hydroxy Acids ◽  
Genetic Elements ◽  
Formose Reaction ◽  
Alkaline Conditions

Sugars are essential for the formation of genetic elements such as RNA and as an energy/food source. Thus, the formose reaction, which autocatalytically generates a multitude of sugars from formaldehyde, has been viewed as a potentially important prebiotic source of biomolecules at the origins of life. When analyzing our formose solutions we find that many of the chemical species are simple carboxylic acids, including α-hydroxy acids, associated with metabolism. In this work we posit that the study of the formose reaction, under alkaline conditions and moderate hydrothermal temperatures, should not be solely focused on sugars for genetic materials, but should focus on the origins of metabolism (via metabolic molecules) as well.

Chiroptical sensing of unprotected amino acids, hydroxy acids, amino alcohols, amines and carboxylic acids with metal salts

2019 ◽  
Vol 55 (44) ◽  
pp. 6297-6300 ◽  
Author(s):  
Ciarán C. Lynch ◽  
Zeus A. De los Santos ◽  
Christian Wolf
Keyword(s):  
Amino Acids ◽  
Carboxylic Acids ◽  
Amino Alcohols ◽  
Metal Salts ◽  
Hydroxy Acids ◽  
Optical Chirality ◽  
Iron Palladium

Optical chirality sensing of unprotected amino acids, hydroxy acids, amino alcohols, amines and carboxylic acids based on a practical mix-and-measure protocol with readily available copper, iron, palladium, manganese, cerium or rhodium salts is demonstrated.

Hydrogen bonding in the gas phase: the thermodynamic properties of hydrogen fluoride-ether complexes and their far infrared spectra

1971 ◽  
Vol 322 (1548) ◽  
pp. 137-146 ◽  
Keyword(s):  
Hydrogen Bonding ◽  
Gas Phase ◽  
Infrared Spectra ◽  
Equilibrium Constants ◽  
Far Infrared ◽  
Methyl Ethyl ◽  
Rotational Contour ◽  
Stretching Vibration ◽  
Conformational Rearrangements ◽  
Far Infrared Spectra

The equilibrium constants of gas-phase complexes of HF with dimethyl, methyl ethyl and diethyl ether have been measured at several temperatures using the Benesi-Hildebrand approximation on the absorption band of the HF stretching vibration in the complex. From these, values of Δ H of — 43, — 38 and — 30 kJ mol -1 respectively, have been determined. They are interpreted in terms of conformational rearrangements of the ethers when they form hydrogen bonds. The far infrared spectra of the complexes with both HF and DF have also been recorded and in each case a band observed at around 180 cm -1 which is assigned to the intermolecular stretching mode of vibration. For the complex between HF and dimethyl ether a rotational contour has been observed at about 10 cm -1 .

THE CARBONYL-STRETCHING VIBRATION OF ARYLALIPHATIC ESTERS

1963 ◽  
Vol 41 (9) ◽  
pp. 2154-2159 ◽  
Author(s):  
Keith Bowden ◽  
N. B. Chapman ◽  
J. Shorter
Keyword(s):  
Infrared Spectra ◽  
Conformational Isomers ◽  
Mass Effects ◽  
Stretching Vibration

The infrared spectra in the carbonyl-stretching region of certain arylaliphatic esters, RCOOMe, have been examined. The stretching frequencies and absorption intensities are presented and are discussed in terms of polar and α-mass effects and the occurrence of conformational isomers.

scholarly journals O-H stretching vibration in Fourier transform difference infrared spectra of bacteriorhodopsin

FEBS Letters ◽  
1991 ◽  
Vol 287 (1-2) ◽  
pp. 157-159 ◽  
Author(s):  
Chia-Wun Chang ◽  
Noriko Sekiya ◽  
Kazuo Yoshihara
Keyword(s):  
Fourier Transform ◽  
Infrared Spectra ◽  
Stretching Vibration

Infrared spectra and conformational equilibrium of cis- and trans-2-chloromethylcyclohexanes

1973 ◽  
Vol 19 (4) ◽  
pp. 1369-1371
Author(s):  
U. Kh. Agaev ◽  
A. T. Alyev ◽  
S. Z. Rizaeva ◽  
Yu. A. Pentin
Keyword(s):  
Infrared Spectra ◽  
Conformational Equilibrium ◽  
Cis And Trans
Sign in / Sign up

Export Citation Format

Share Document