Results 21 to 30 of about 10,075 (214)
Natural Product Communications, 2009 Enantiomeric ratios of linalool have been determined in various authentic essential oils of Indian origin using 10% heptakis(2,3-di- O -methyl-6- O -tert-butyldimethylsilyl)-β-cyclodextrin as a chiral stationary phase. A complete enantiomeric excess (ee)
Chandan S. Chanotiya, Anju Yadav
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Journal of Lipid Research, 1982 Simple methods for determining the enantiomeric purity of mevalonolactone and linalool by NMR using the chiral shift reagent Eu(hfc)3 are reported. These methods are more reliable than polarimetry and require only a few milligrams of sample to detect as ...
W K Wilson, T J Scallen, C U Morrow
doaj +1 more source
Geophysical Research Letters, 2022 Amino acids are important targets in the search for life beyond Earth. The types of amino acids, their relative abundances, and enantiomeric excess all serve as biosignatures.
Zuzana Cieslarova +3 more
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Journal of Pharmaceutical Analysis, 2016 A simple analytical high-performance liquid chromatography (HPLC) method was applied for the enantiomeric excess determination of esomeprazole ((S)-OME), the enantiopure active ingredient contained in drug products, in the presence of its potential ...
Bruno Gallinella +5 more
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Determination of Enantiomeric Excess in Amine Derivatives with Molecular Self‐Assemblies [PDF]
Angewandte Chemie, 2015 AbstractWe report the first fluorescence‐based assay for the rapid determination of the ee value of amines, amino alcohols, and amino acid esters. The method uses the self‐assembly of 2‐formylphenylboronic acid with a chiral diol and a chiral amine or derivatives (of unknown chirality) to produce two diastereomeric iminoboronates that differ in their ...
Shcherbakova, Elena G. +4 more
openaire +2 more sources
Redirecting a Native Ene‐Reductase Toward Desaturation With Reverse Enantioselectivity
Angewandte Chemie, EarlyView.A native ene‐reductase, XenA, was repurposed to catalyze the reverse‐enantioselective desaturation of cyclohexanones. The final variant was obtained through extensive protein engineering, combining PROSS‐guided computational design with mutagenesis and screening.
Qing‐Qing Zeng +4 more
wiley +2 more sources
BIO Web of Conferences, 2014 What is the role played by amino acids in the chemistry of the interstellar medium and the emergence of life on the early Earth? Are they really the primary key compounds as free amino acids?
Guillemin J-C.
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Angewandte Chemie, EarlyView.An enantioselective rhodium‐catalyzed [2 + 2 + 2] cycloaddition enables the synthesis of axially chiral diaryl ethers. Carbonyl coordination ensures high reactivity and regioselectivity, affording products bearing up to four stereogenic axes with good enantio‐ and diastereoselectivity.
Yu Sato +3 more
wiley +2 more sources
MATEC Web of Conferences, 2015 A systematic theoretical derivation of bioresolution-inversion process was made. An equation was derived between the maximum ee value of final product (eef(max)) and enantiomeric ratio (E) of a reaction. The corresponding equations of conv.(max), eep(max)
Xu Yi, Zhou Dan, Chen Jianbo
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Asymmetric Iron‐Catalyzed Vicinal C(sp3)─H Diamination of Carboxylic Acids
Angewandte Chemie, EarlyView.An iron‐catalyzed vicinal α,β‐C(sp3)─H diamination of readily available carboxylic acids furnishes chiral α,β‐diamino acids in a single pot with high regio‐, diastereo‐, and enantioselectivity (up to >20:1 dr and >99% ee). ABSTRACT The direct construction of chiral 1,2‐diamines through the stereoselective functionalization of two vicinal C(sp3)─H bonds
Bing Zhou +5 more
wiley +2 more sources