Results 221 to 230 of about 35,698 (262)

Examples of diastereomers

Journal of Chemical Education, 1984
Using right- and left-handed doors as examples of familiar objects that exhibit enantiomerism.
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Synthesis and chiroptical characterization of prostacyclin diastereomers

Prostaglandins, 1980
In the mercuri- and halo-cyclizations of PGF2 alpha methyl ester and its 11,15-bis(alpha- ethoxyethyl)-ether (or other protected forms) the exo-PGI1 derivative predominates independent of reagent and degree of protection of the PGF2 alpha sample used. Diastereomerically pure samples of exo- and endo-PGI1 and prostacycline (PGI2) were prepared.
, De Biswanath, N H, Andersen, R M, Ippolito, C H, Wilson, W D, Johnson   +4 more
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A Solid-State Diastereomer, AgLa3GeS7

Inorganic Chemistry, 1995
A solid-state diastereomer, demonstrated by the structure of the noncentrosymmetric AgLa{sub 3}GeS{sub 7} phase, is reported for the first time. The title compound belongs to a large family of complex chalcogenides that have a general formulation of A(RE){sub 3}MQ{sub 7}, where A = Cu, Ag; RE = La-Er, Y; M = Si, Ge, Sn; and Q = S, Se.
Shiou-Jyh Hwu, Cordelia K. Bucher, James D. Carpenter, Stephen P. Taylor   +3 more
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Synthesis of diastereomers of sarcolysylleucine

Bulletin of the Academy of Sciences of the USSR Division of Chemical Science, 1978
1. The diastereomers of sarcolysylleucine with a formylated and free amino group in sarcolysine residue were obtained by using the N-ethoxycarbonyl-2-ethoxy-1, 2-dihydroquinoline method to form the peptide linkage. 2. The possibility of deformylating peptides, containing the di-2-chloroethyl group, by hydrazine acetate was studied.
K. I. Karpavichyus, R. B. Klyukene, O. V. Kil'disheva   +2 more
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Rotamers or Diastereomers? An Overlooked NMR Solution

The Journal of Organic Chemistry, 2012
The existence of rotamers in a solution of analyte complicates (1)H NMR analysis, especially when the presence of diastereomers is also possible. Organic chemists have often responded to this problem by conducting variable-temperature (VT) NMR experiments, changing NMR solvents, or adding complexing agents.
Dennis X, Hu, Peter, Grice, Steven V, Ley   +2 more
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Diastereomer Configurations from Joint Experimental–Computational Analysis

The Journal of Organic Chemistry, 2012
The potential of the approach combining nuclear magnetic resonance (NMR) spectroscopy, relaxed grid search (RGS), molecular dynamics (MD) simulations, and quantum mechanical (QM) calculations for the determination of diastereomer configurations is demonstrated using four diastereomers of a trisubstituted epoxide.
Abil E, Aliev, Zakirin A, Mia, Mathilde J M, Busson, Richard J, Fitzmaurice, Stephen, Caddick   +4 more
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Diastereomer Interconversion via Enolization: A Case Study

Chirality, 2015
AbstractThe three‐component reaction of indole, isobutyraldehyde, and methyl acetoacetate affords methyl 2‐(acetyl)‐3‐(1H‐indol‐3‐yl)‐4‐methylpentanoate as a single diastereomer. To investigate the origin of the observed diastereoselectivity, the thermodynamics and kinetics of interconversion of diastereomers 1 and 2 in solution were studied by a ...
Renzetti, Andrea, Di Crescenzo, Antonello, Nie, Feilin, Bond, Andrew D., Gérard, Stéphane, Sapi, Janos, Fontana, Antonella, VILLANI, Claudio   +7 more
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Thermal properties of isomalt: A diastereomer mixture

Journal of Thermal Analysis and Calorimetry, 2002
Isomalt, a commercial sugar alcohol widely used as a sweetener, is approximately a 1:1 mixture of two diastereomers, α-D-glucopyranosyl-1-6-mannitol (GPM) and α-D-glucopyranosyl-1-6-sorbitol (GPS). A calorimetric investigation has been carried out on mixtures of isomalt with GPS, in the (molar) composition range 0 ...
BORDE B., CESARO, ATTILIO
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The natural occurrence of magnosalicin diastereomers

Phytochemistry, 1997
Aniba puchury-minor contains besides common mono- and chiefly sesquiterpenes, asaraldehyde and a series of monomeric arylpropanoids including E-asarone, magnosalicin and two of its diastereomers. © 1997 Elsevier Science Ltd.
Maria De Fátima Da Silva, Francisca S.N. Taveira, José Guiliierme Soares Maia, Lucia M. Conserva, Massayoshi Yoshida, Otto R. Gottlieb   +5 more
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Separation of diastereomers of methylphosphonate dinucleotides

Tetrahedron Letters, 1986
Abstract A chiral derivatizing agent, 1-menthyl chloroformate, has been used as a 3′-OH blocking group to facilitate the resolution of diastereomers of methylphosphonate dinucleotides by silica gel column chromatography.
S.B. Katti, Kan Agarwal
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