Results 201 to 210 of about 13,012 (246)
Active Sites in Sn-Beta for Glucose Isomerization to Fructose and Epimerization to Mannose [PDF]
ACS Catalysis, 2014 Framework Lewis acidic tin sites in hydrophobic, pure-silica molecular sieves with the zeolite beta topology (Sn-Beta) have been reported previously to predominantly catalyze glucose−fructose isomerization via 1,2 intramolecular hydride shift in water ...
Mark E Davis +2 more
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Tetrahedron, 1994
Abstract Epimerization of tilivalline (1) at the C11-position occurred by treatment with zinc chloride to give a mixture of 1 and its 11-epimer (epi-1) in a ratio of 83 : 17. The computational chemical analysis of the thermodynamic stability of 1 and epi-1 through MM3(92) also revealed the energetic preference of 1 and the calculated equilibrium ...
Takatoshi Matsumoto +5 more
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Abstract Epimerization of tilivalline (1) at the C11-position occurred by treatment with zinc chloride to give a mixture of 1 and its 11-epimer (epi-1) in a ratio of 83 : 17. The computational chemical analysis of the thermodynamic stability of 1 and epi-1 through MM3(92) also revealed the energetic preference of 1 and the calculated equilibrium ...
Takatoshi Matsumoto +5 more
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THE EPIMERIZATION OF DELCOSINE
Canadian Journal of Chemistry, 1961Delcosine has been assigned tentatively the same C—N skeleton as lycoctonine. In lycoctonine, ring A carries at C-1 a methoxyl group which is directed away from the nitrogen ring. In delcosine, C-1 carries a hydroxyl group which has the opposite configuration and is directed towards the nitrogen.
Vinko Skarić, Léo Marion
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Diastereodivergent De‐epimerization in Catalytic Asymmetric Allylic Alkylation [PDF]
Angewandte Chemie - International Edition, 2012 Diastereomers made to order: In an unprecedented ligand-controlled process a racemic mixture of four stereoisomers can be converted with high selectivity into each one of the diastereomers of the product, at will (see scheme).
Davide Audisio +2 more
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Chromatographic properties of the epimeric estriols
Journal of Chromatography A, 1971Abstract Thin-layer and gas chromatographic methods to separate the epimeric estriols are described. Gas chromatography of the acetates provided separation of all four. Thin-layer chromatography on Silica Gel G separated the cis from the trans estriols. The trans epimers separated only on silica gel modified with ammonium bisulfate.
J C, Touchstone +2 more
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Epimerization in peptide thioester condensation
Journal of Peptide Science, 2012Peptide segment couplings are now widely utilized in protein chemical synthesis. One of the key structures for the strategy is the peptide thioester. Peptide thioester condensation, in which a C‐terminal peptide thioester is selectively activated by silver ions then condensed with an amino component, is a powerful tool.
Kenta, Teruya +4 more
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Epimerization of 6-bromoprogesterone
Steroids, 1986Epimerization of 6-bromoprogesterone is observed by 1H NMR. The equilibrium constant K = 1.5 and the standard free-energy delta G = -241 cal/mol at 302 K.
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Antiprotozoal Activities of Epimeric Aminobicycles.
ChemInform, 2007AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Werner Seebacher +4 more
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Chirality, 1999
We investigated the mechanism of epimerization (R to S or S to R) of moxalactam in serum of rats, dogs, and humans. The epimerization of moxalactam occurred in the serum of these animals, but not in the serum filtrate. The albumin fraction of human serum purified by gel filtration catalysed the epimerization of moxalactam at an identical rate to serum,
T, Yoshikawa +5 more
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We investigated the mechanism of epimerization (R to S or S to R) of moxalactam in serum of rats, dogs, and humans. The epimerization of moxalactam occurred in the serum of these animals, but not in the serum filtrate. The albumin fraction of human serum purified by gel filtration catalysed the epimerization of moxalactam at an identical rate to serum,
T, Yoshikawa +5 more
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Kinetics of the epimeric glucocorticoid budesonide
Clinical Pharmacology and Therapeutics, 1984Budesonide is a potent nonhalogenated glucocorticoid consisting of a 1/1 mixture of the two epimers 22R and 22S. The kinetics of these epimers were studied in six healthy male subjects after intravenous administration of 500 micrograms 3H-budesonide. Estimation of the epimer concentrations in plasma was made possible by development of an HPLC method ...
A, Ryrfeldt, S, Edsbäcker, R, Pauwels
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