Results 71 to 80 of about 19,944 (197)

A heterobimetallic tetrahedron from a linear platinum(II)-bis(acetylide) metalloligand

Beilstein Journal of Organic Chemistry, 2020
Employing 4-ethynylaniline as a simple organic ligand we were able to prepare the stable trans-bis(acetylide)platinum(II) complex [Pt(L1)2(PBu3)2] as a linear metalloligand.
Matthias Hardy, Marianne Engeser, Arne Lützen   +2 more
doaj   +1 more source

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
doaj  

Synthesis of the Eight Enantiomerically Pure Diastereomers of the 12-F₂-Isoprostanes

, 2016
Syntheses of the eight enantiomerically pure diastereomers of the 12-F2-isoprostanes (4−11) are described. The key steps included rhodium-mediated intramolecular cyclopropanation and enzymatic resolution of the racemic diol ...
Ming Xu (151206), Douglass F. Taber (1568878), John C. Hartnett (2988495)   +2 more
core   +3 more sources

A Practical Method for the Stereochemical Analysis of Acyclic Terpenoid Carbonyl Compounds

CHIMIA, 1989
The stereoisomeric composition of acyclic terpene aldehydes and ketones can be assayed by derivatization with L(+)-diisopropyl tartrate and separation of the ensuing acetal diastereomers by gas chromatography.
Andreas Knierzinger, Willy Walther, Beat Weber, Thomas Netscher   +3 more
doaj   +1 more source

NMR Characterization of Flavanone Naringenin 7-O-Glycoside Diastereomer

Chinese Journal of Magnetic Resonance, 2017
To discriminate R and S flavanone glycoside using NMR, the mixture of R and S naringenin 7-O-glycoside was first isolated from Gleditsia sinensis. 1H and 13C NMR data of the mixture were recorded with 1H NMR, 13C NMR, 1H-1H COSY, 1H-13C HSQC and 1H-13C ...
SUN Li-juan, HU Xiao-fang, CHENG Xun, LUO Li-ting, LIU Hong-bing, CHEN Lei   +5 more
doaj   +1 more source

Total Synthesis of Both Spiroketal Diastereomers of the Reported Structure of Cephalosporolide H

, 2013
A total synthesis of both spiroketal diastereomers of the reported structure of cephalosporolide H is accomplished in 12 steps and 9% overall yield. The key steps involve Keck's allylation, cross metathesis (to get the desired beta,gamma-unsaturated ...
FERNANDES, RA, HALLE, MB
core   +1 more source

Determination of the relative configuration of tropinone and granatanone aldols by using TBDMS ethers

Beilstein Journal of Organic Chemistry, 2012
The relative configurations of tert-butyldimethylsilyl (TBDMS) ethers of all four diastereomers of the aldols of tropinone (8-methyl-8-azabicyclo[3.2.1]octan-3-one), as well as of granatanone (9-methyl-9-azabicyclo[3.3.1]nonan-3-one), were determined ...
Ryszard Lazny, Aneta Nodzewska, Katarzyna Sidorowicz, Przemyslaw Kalicki   +3 more
doaj   +1 more source

The First Synthesis and Characterization of Both Diastereomers of a Di[2.2]paracyclophane:  4,4‘-Bis(1,1,2,2,9,9,10,10-octafluoro[2.2]paracyclophane)

, 2016
The synthesis and characterization of both diastereomers of a system comprised of two [2.2]paracyclophane units linked through a single 4,4‘ bond are described.
A. J. Roche (3030345), K. A. Abboud (2964015), J.-X. Duan (3030348), W. R. Dolbier, (2668774)   +3 more
core   +1 more source

Synthesis of (±)-africanol

Journal of the Brazilian Chemical Society, 2000
Two diastereomers of africanol, compounds 1a and 1b, were obtained exclusively through a methodology which employed, as the key step, the nBuLi mediated intramolecular cyclization of the vinyl iodide 5.
Marques Francisco de A., Ferreira José T. B., Piers Edward   +2 more
doaj  

Separation of isobaric phosphorothioate oligonucleotides in capillary electrophoresis: study of the influence of cationic cyclodextrins on chemo and stereoselectivity

Frontiers in Analytical Science
Phosphorothioate (PS) oligonucleotides have drawn more and more attention lately due to their great therapeutic potential. The presence of one (or several) phosphorothioate moiety (ies) improves pharmacokinetic properties but at the same time creates an ...
Maryam K. Ghassemi, Vincent Hurlet, Jacques Crommen, Anne-Catherine Servais, Marianne Fillet   +4 more
doaj   +1 more source