Results 21 to 30 of about 13,012 (246)
Inorganics, 2018 The present article reports the application of vibrational circular dichroism (VCD) and temperature-dependent electronic circular dichroism (ECD) methods to reveal the dynamical aspects of a star-burst tetranuclear metal complex with a labile central ...
Hisako Sato +2 more
doaj +1 more source
Aspects of the epimerization of certain tetracycline derivatives [PDF]
, 1968 The epimerization of several tetracycline derivatives was examined at several pH values using varying conditions of temperature and buffer strength. Rate coefficients for the epimerization of tetracycline and demethylchlortetracycline are reported and ...
Edwin T Sugita +3 more
core +1 more source
Methionine epimerization in cyclic peptides
RSC Advances, 2021 One step regioselective methionine epimerization in cyclic peptides followed by selective functionalization leads to chemical novelty.
Pramodkumar D. Jadhav +5 more
openaire +3 more sources
Development and optimization of photoredox-mediated methine epimerization [PDF]
, 2021 Reactions that edit the stereochemistry of individual atoms are enabling tools in synthetic chemistry. The Wendlandt lab has developed a sequential H-atom abstraction and donation strategy to synthesize rare sugars from biomass platform molecules such as
Wang, Kathleen J
core
Visible Light-Mediated, Diastereoselective Epimerization of Morpholines and Piperazines to More Stable Isomers [PDF]
, 2022 We report a photocatalyzed epimerization of morpholines and piperazines that proceeds by reversible hydrogen atom transfer (HAT) and provides an efficient strategy for editing the stereochemical configurations of these saturated nitrogen heterocycles ...
Zican Shen (5931245) +4 more
core +1 more source
Data-driven Electrochemical One-pot Synthesis of Double Hetero[7]dehydrohelicene
Electrochemistry, 2023 The pursuit of chiral nanographenes with robust chiral stability and good chiroptical responses is of great interest for material-based applications.
Mohamed S. H. SALEM +7 more
doaj +1 more source
The epimerization of α-chiral hydrazones: Menthonetosylhydrazone [PDF]
, 1993 The first preparation of (-)-menthonetosylhydrazone (2) in diastereomerically pure form is reported. Kinetic studies show that 2 is far more susceptible to acid-catalyzed epimerization (∼150x) than is the parent ketone, (-)-menthone (1), a relationship ...
Garner, Charles M. +5 more
core +1 more source
Stereoselective Epimerizations of Glycosyl Thiols
Organic Letters, 2017 Glycosyl thiols are widely used in stereoselective S-glycoside synthesis. Their epimerization from 1,2-trans to 1,2-cis thiols (e.g., equatorial to axial epimerization in thioglucopyranose) was attained using TiCl4, while SnCl4 promoted their axial-to-equatorial epimerization.
Lisa M. Doyle +5 more
openaire +3 more sources
Molecules, 2020 An efficient asymmetric synthesis of GlaxoSmithKline’s potent PDE4 inhibitor was accomplished in eight steps from a catechol-derived nitroalkene. The key intermediate (3-acyloxymethyl-substituted 1,2-oxazine) was prepared in a straightforward manner by ...
Evgeny V. Pospelov +3 more
doaj +1 more source
Epimerization of total, free, and bounded isoleucine in fossil test of the Globorotalia tumida-menardii complex isolated from sediment core GIK13519-2, Sierra Leone Rise (Table 1) [PDF]
, 1984 Epimerization of total, free, and bounded isoleucine in fossil test of the Globorotalia tumida-menardii complex isolated from sediment core GIK13519-2, Sierra Leone Rise (Table ...
Peter J Müller (6959537) +1 more
core +1 more source