The structure of the stable conformers of N-ethylacetamide and N-isopropylacetamide was determined by NMR spectroscopy with lanthanide shift reagents. N-ethylacetamide was found to exist in the form of two mirror-image isomers, with the ethyl group twisted out of the plane of the amide bond by t...
Betaine (N,N,N-trimethylglycine) and N,N-dimethylglycine have been reported to have anticonvulsant properties in animals. The purpose of the present study was to determine whether these compounds can antagonize strychnine-induced seizures when administered intraperitoneally and to compare their ...
We recruited nondiabetic subjects (n = 158) attending a lipid disorders clinic, a subset of whom (n = 46) had established cardiovascular disease. Glycine betaine, N,N-dimethylglycine, and carnitine were measured in fasting plasma and urine samples. The concentrations and excretions were related ...
Homocysteine and 5-CH3-tetrahydrofolate (5-CH3-THF) are converted to methionine and THF by the CH3-cobalamin (CH3-Cbl)-dependent enzyme methionine synthase. Serum homocysteine levels are elevated in more than 95% of patients with Cbl or folate deficiency and in patients with inborn errors involv...
A theoretical analysis for the proton transfer equilibrium reaction involving the most stable unionized tautomeric conformer of N,N-dimethylglycine, IIu, and its most stable zwitterionic tautomeric conformer, Iz, has been accomplished. High-level ab initio calculations, which include geometry op...
Eight of the most stable conformers of N-methylglycine (NMG) and five of N,N-dimethylglycine (DMG) were analyzed by high level ab initio calculations. Since NMG has only one amino hydrogen and a carboxylic acid hydrogen, it is capable of the formation of various types of hydrogen-bonded conforme...
A gas chromatographic method for the determination of N,N-dimethylglycine in urine has been developed. After clean-up by cation-exchange, N,N-dimethylglycine was derivatized with ethanol and hydrochloric acid to form the corresponding ethyl ester. After evaporation of solvent, N,N-dimethylglycin...
A method is described for the determination of betaine and its metabolite N,N-dimethylglycine in human urine. The method involves a deamination step and a solid-phase extraction to isolate both substances from urine followed by high performance liquid chromatography (HPLC) separation on a 5-μm ...
Amino acid conformational analysis is widely studied in the literature. However, information about the intramolecular interactions that govern their conformational preferences is scarce and it is commonly attributed to intramolecular hydrogen bond formation. The present paper utilizes calculatio...
Ketamine, a dissociative anesthetic, produces rapid and sustained antidepressant effects at subanesthtic doses. However, it still inevitably induces psychotomimetic side effects. N,N-dimethylglycine (DMG) is a derivative of the amino acid glycine and is used as a dietary supplement. Recently, DM...
CuI/N,N-dimethylglycine catalyzed coupling of aryl bromides with substituted oxazolidinones took place at 120 °C in DMF, affording the corresponding N-arylation products with good to excellent yields. A number of functional groups, such as ketone, nitrile, nitro, methoxy, and hydroxyl were tole...
The molecular structure, intramolecular hydrogen and vibrational frequencies of 4-methylamino-3-penten-2-one were investigated by a series of density functional theoretical (DFT) calculations and ab initio calculation at the post-Hartree–Fock (MP2) level. Fourier transform infrared and Fourier ...
Vapor-phase catalytic dehydration of 5-amino-1-pentanol was investigated over various oxide catalysts including rare earth oxides (REOs). Over ordinary acidic oxides such as Al2O3, SiO2, SiO2-Al2O3, TiO2, and ZrO2, a cyclic amine such as piperidine was mainly produced at temperatures of 300 °C ...
Ab initio calculations at the post Hartree–Fock level (MP2) have been used for a complete study of molecular structures of all possible conformations of 4-amino-3-penten-2-one (APO) to obtain the order of stability and relative hydrogen bond strength in four of the conformers. The comparison of...
Photoisomerization mechanism of 4-amino-3-penten-2-one, a chelated keto-enamine isomer, has been studied by low-temperature matrix-isolation infrared (IR) spectroscopy. Conformations of the reactant and two photoproducts were determined by comparison of the observed IR spectra with the calculate...
Fourier transform infrared and Fourier transform Raman spectra of 4-amino-3-cyano-3-penten-2-one and its deuterated analogue have been obtained. Density functional theory (DFT) B3LYP and G96LYP calculations have been carried out with the purpose of understanding the vibrational spectra of this c...
The infrared and Raman spectra of 4-amino-3-penten-2-one and its two deuterated analogous have been measured. Comparison between the spectra recorded with two techniques, density functional theory (DFT) calculations and the spectral behavior upon deuteration was used for assignment of the vibrat...
Several substituted 4-amino-3-penten-2-one derivatives have been theoretically investigated in order to study conjugative and/or steric effects on the molecular structure and intramolecular hydrogen bond strengths. The molecular geometry and intramolecular hydrogen bond energy of 4-amino-3-pente...
The stoichiometry, stability, and mode of coordination of the 2-, 3-, 4-cyanopyridine, 3-aminocrotononitrile, and 3-aminobutyronitrile complexes of copper(I) in propylene carbonate were investigated by polarography, potentiometry, and infrared spectroscopy. No evidence for the formation of the 1...
RésuméOn a polymérisé le méthyl-2 pentadiène-1,3 trans en un polymère cristallin à enchainements 1,4 cis à l'aide du système catalytique TiCl4AIR3 et en un polymère cristallin à enchaînements 1,4 trans à l'aide du système catalytique Ti (OR)4VCl3AIR3. L'action ...
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