Results 1 to 10 of about 14,574 (240)

Double Intramolecular Transacetalization of Polyhydroxy Acetals: Synthesis of Conformationally-Restricted 1,3-Dioxanes with Axially-Oriented Phenyl Moiety

Molecules, 2016
The synthesis of conformationally-restricted 1,3-dioxanes with a phenyl moiety fixed in an axial orientation at the acetalic center is described. Starting with diethyl 3-hydroxyglutarate (15), benzaldehyde acetal 12a and acetophenone ketal 12b bearing a ...
Samuel Asare-Nkansah, Bernhard Wünsch
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The Effect of Alkyl Substituents on the Formation and Structure of Homochiral (R*,R*)-[R₂Ga(µ-OCH(Me)CO₂R′)]₂ Species—Towards the Factors Controlling the Stereoselectivity of Dialkylgallium Alkoxides in the Ring-Opening Polymerization of rac-Lactide

Molecules
Building on our previous studies, which have demonstrated that homochiral propagating species—(R*,R*)-[Me2Ga(µ-OCH(Me)CO2R)]2—were crucial for the heteroselectivity of [Me2Ga(µ-OCH(Me)CO2Me)]2 in the ring-opening polymerization (ROP) of racemic lactide ...
Magdalena Kaźmierczak, Łukasz Dobrzycki, Maciej Dranka, Paweł Horeglad   +3 more
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Diastereoselective Spiroannulation of Phenolic Substrates: Advances Towards the Asymmetric Formation of the Manumycin m-C7N Core Skeleton

Molecules, 2007
The asymmetric syntheses of two new spirolactones prepared in optically pure form from L-3-nitrotyrosine are described. The key step, an oxidative spiroannulation, was carried out on the optically active phenols 11a and 11b and afforded the new ...
Thomas W. Scully, Jolene S. Kwasnitza, Randy R. Spaetzel, Guy L. Plourde   +3 more
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Separation of folinic acid diastereomers in capillary electrophoresis using a new cationic β-cyclodextrin derivative. [PDF]

PLoS ONE, 2015
A method for the separation of folinic acid diastereomers by capillary electrophoresis in chiral separation media was developed. Aiming to achieve a good separation of the anionic analytes, a newly synthesized cationic β-cyclodextrin derivative, mono-6 ...
Jia Yu, Xinlei Liang, Zhaokun Wang, Xin Guo, Tiemin Sun, Xingjie Guo   +5 more
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Data for isolation and properties analysis of diastereomers of a mono-substituted phosphoryl guanidine trideoxyribonucleotide

Data in Brief, 2019
This article presents new data on the properties of the diastereomers of a mono-substituted phosphoryl guanidine trideoxyribonucleotides d(TpCp*A) [1,2].
Alexander A. Lomzov, Maxim S. Kupryushkin, Andrey V. Shernyukov, Mikhail D. Nekrasov, Ilya S. Dovydenko, Dmitry A. Stetsenko, Dmitrii V. Pyshnyi   +6 more
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The synthesis of the 2,3-difluorobutan-1,4-diol diastereomers

Beilstein Journal of Organic Chemistry, 2017
The diastereoselective synthesis of fluorinated building blocks that contain chiral fluorine substituents is of interest. Here we describe optimisation efforts in the synthesis of anti-2,3-difluorobutane-1,4-diol, as well as the synthesis of the ...
Robert Szpera, Nadia Kovalenko, Kalaiselvi Natarajan, Nina Paillard, Bruno Linclau   +4 more
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Investigating the Stereochemistry of α-Carbon in Lignin Preparations and Lignin Model Compounds Using 77Se NMR

BioResources, 2015
Studying the stereochemistry of lignin as a natural chiral polymer may have scientific and technical importance regarding the behavior of lignin and delignification processes.
Mahnaz Oghbaie, Seyed Ahmad Mirshokraie, Abdol H. Massoudi   +2 more
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Analysis of L- and D-Amino Acids Using UPLC

Bio-Protocol, 2014
With the exception of glycine, α-amino acids are optically active, and two optical isomers (L- and D-) of each amino acid can be formed. Recent developments of analytical techniques have revealed that several free D-amino acids such as D-aspartate, D ...
Yuta Mutaguchi, Toshihisa Ohshima
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Synthesis of phosphatidylcholine analogs with an alkyl group at C1 or C3 of the glycerol moiety.

Journal of Lipid Research, 1985
The syntheses of 1,2-di-(O-hexadecyl)-rac-glycero-3-phosphocholines containing a methyl group at either C1 or C3 of the glycerol moiety are described. The methyl group was introduced at C1 in a synthetic scheme beginning with the hydroxylation of methyl ...
N M Witzke, R Bittman
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Optical resolution of racemic myo-inositol derivatives into enantiomers for the synthesis of inositol-containing phospholipids with natural structures

Тонкие химические технологии, 2011
Methods for resolution (splitting) of racemic myo-inositol derivatives into optical antipods via formation of diastereomeric compounds with carbohydrates are reviewed.
A. E. Stepanov, V. I. Shvets
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