Results 211 to 220 of about 13,012 (246)

Mechanistic aspects of enzymatic carbohydrate epimerization

Natural Product Reports, 2002
AbstractFor Abstract see ChemInform Abstract in Full Text.
Jomy, Samuel, Martin E, Tanner
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Epimerization of isotactic polystyrene

Polymer Bulletin, 1979
A procedure for epimerizing isotactic polystyrene and a Monte-Carlo computer program for simulating polymer epimerization reactions have been developed. The 300 MHz methine proton resonance patterns of partially epimerized isotactic polystyrene and of free radical initiated polystyrene have been analyzed.
Lloyd Shepherd, Teng Ko Chen, H. James Harwood   +2 more
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Epimerization in the synthesis of thiophosphoanhydrides

Bioorganic Chemistry, 1988
Abstract Reaction of ( R p )-[β- 17 O]ADPβs or ( S p )-[β- 17 O]ADPβs (adenosine 5′,2-thio[2- 17 O]diphosphate with R and S configurations, respectively, at P 2 ) with diphenylchlorophosphate for 15 min in hexamethylphosphoramide followed by aqueous workup produces ( R p )- and ( S p )-P 1 -5′-ado-P 3 -phenyl-2-thio[2- 17 O]triphosphate as an
Radha Iyengar, Perry A. Frey
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Epimerization of Chlorophyll Derivatives. V. Effects of the Central Magnesium and Ring Substituents on the Epimerization of Chlorophyll Derivatives

Bulletin of the Chemical Society of Japan, 1992
Abstract Kinetic and equilibrium features of the epimerization in six C132-epimer pairs of chlorophyllous pigments, namely chlorophyll (Chl) a/a′, Chl b/b′, pheophytin (Pheo) a/a′, Pheo b/b′, C20-chlorinated Chl (Cl–Chl) a/a′, and Cl–Pheo a/a′, catalyzed by bases (triethylamine, pyrrolidine, and piperidine) and by Lewis acids (magnesium ...
Mazaki, Hitoshi, Watanabe, Tadashi, Takahashi, Terumi, Struck, Andreas, Scheer, Hugo   +4 more
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An unusual epimerization of a thioether

Journal of Sulfur Chemistry, 2012
Reaction of 6-exo-methylthio-2-exo-phenylbicyclo[2.2.1]heptan-2-endo-ol with sodium azide and acid afforded the corresponding 2-exo-azide. This azide was reduced and acetylated to give a crystalline derivative whose structure was unequivocally established by X-ray crystallographic analysis.
Woo Jin Chung, Ganga Viswanathan Bhagavathy, Neil E. Jacobsen, Stephanie Senef, Richard S. Glass   +4 more
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1.5.1 Racemization and Epimerization

2015
AbstractBiocatalytic racemization represents the reversible interconversion of an enantiomer to its mirror image and is catalyzed by racemases. In the context of organic synthesis, it represents the key step to turn a kinetic resolution into a dynamic process.
K. Faber, S. M. Glueck
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Determination of the epimeric composition of ibuprofenyl-CoA

Analytical Biochemistry, 1991
Ibuprofen [racemic2-(4-isobutylphenyl)propionic acid] is a 2-arylpropionic acid nonsteroidal anti-inflammatory drug which undergoes unidirectional, R to S chiral inversion in vivo. It has been proposed that this chiral inversion phenomenon occurs via a coenzyme A (CoA) thioester intermediate.
T S, Tracy, S D, Hall
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Synthesis of the Epimeric Secosteroids Strophasterols A and B

Angewandte Chemie International Edition, 2017
AbstractTwo epimeric rearranged ergostanes, strophasterols A and B, with an unprecedented carbon skeleton were synthesized from ergosterol, both in 17 steps via a common secosteroidal intermediate. The conversion of ergosterol into the pivotal intermediate involved an efficient acid‐catalyzed double‐bond migration from ring B to ring D, oxidative ...
Shuntaro Sato, Yuki Fukuda, Yusuke Ogura, Eunsang Kwon, Shigefumi Kuwahara   +4 more
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Epimerizations of perhydrophenanthrenes

Tetrahedron Letters, 1971
Dalia Kogan, Yehuda Mazur
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epimere, n.

2023
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