Zobrazeno 1 - 10 of 10 pro vyhledávání: '"Willi Walther"'
1
Design and development of chiral reagents for the chromatographic e.e. determination of chiral alcohols
Autor: Thomas Netscher, Willi Walther
Publikováno v: Chirality. 8:397-401
(S)-Trolox methyl ether is known as a powerful chiral reagent for the e.e. determination of chiral alcohols by separation of the corresponding diastereoisomeric esters on achiral GC and SFC columns. In order to further improve his methodology, five p
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::69b9a73900eb4afd53f81d744a474a9a
https://doi.org/10.1002/(sici)1520-636x(1996)8:5<397::aid-chir7>3.0.co
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2
Pyrrolidides as derivatives for the determination of the fatty acids of triacylglycerols by gas chromatography
Autor: Walter Vetter, Willi Walther
Publikováno v: Journal of Chromatography A. 686:149-154
Triacylglycerols can be converted quantitatively into the pyrrolidides of their constituent fatty acids. On the basis of this reaction, an easy and highly accurate gas chromatographic method for the determination of the fatty acids from triacylglycer
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::67a960c4df42607413bf52da5217638e
https://doi.org/10.1016/0021-9673(94)00079-4
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3
Direct and indirect approaches to enantiomeric separation of benzodiazepines using micro column techniques
Autor: Susanne R. Almquist, Willi Walther, Karin E. Markides, Patrik Petersson
Publikováno v: Journal of Chromatography A. 679:139-146
The ability of gas chromatography, supercritical fluid chromatography (SFC) and subcritical fluid chromatography to separate ten benzodiazepine racemates, using both direct and indirect methods, has been investigated. Racemic lorazepam, oxazepam, eth
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::b750519202ed27b83f65f478cc91540a
https://doi.org/10.1016/0021-9673(94)80320-x
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4
Large scale preparation of chiral building blocks for the P3 site of renin inhibitors
Autor: Wolfgang Wostl, Ernst Kupfer, Thomas Weisbrod, Beat Wirz, Stephan Doswald, Willi Walther, Heinz Stadler, Heinrich Estermann
Publikováno v: Bioorganic & Medicinal Chemistry. 2:403-410
Racemic ethyl 2-benzyl-3-(tert-butylsulfonyl)propionate (1) and racemic ethyl 2-benzyl-3-[[1-methyl-1-((morpholm-4-yl)carbonyl)ethyl]sulfonyl]p (3) were enantioselectively hydrolyzed by subtilisin Carlsberg generating the respective (S)-acids used as
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6dc3f92921a8150ea13f010f1824cb3c
https://doi.org/10.1016/0968-0896(94)80007-3
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6
[26] Separation of the eight stereoisomers of all-rac-α-tocopherol from tissues and plasma: Chiral phase high-performance liquid chromatography and capillary gas chromatography
Autor: Ernst Glinz, Willi Walther, Alfred W. Kormann, Georges Riss, Urs B. Ranalder
Publisher Summary This chapter introduces chiral phase high-performance liquid chromatography (HPLC) and capillary gas chromatography (GC). These methods are used to evaluate patterns of all α-tocopherol (TOH) stereoisomers in rat tissues and plasma
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::9c1cbcfb9fec46637851bd4865e10f1a
https://doi.org/10.1016/0076-6879(94)34097-8
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7
Gas chromatographic enantiomer separation of some atropisomeric 6,6′-dimethyl-1,1′-biphenyl derivatives on permethylated β-cyclodextrin
Autor: Marco Cereghetti, Willi Walther
Publikováno v: Journal of High Resolution Chromatography. 14:57-58
The various 2,2'-disubstituted derivatives of the 6,6'-dimethyl-1,1'-biphenyl system 1a-g, were intermediates in our synthesis of axially dissymmetric diphosphine ligands, e.g. BIPHEMP used for transition metal catalyzed asymmetric hydrogenations and
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::bb0e68970ae12c73300b2d02959b2f43
https://doi.org/10.1002/jhrc.1240140114
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8
Preparation on inert glass capillary columns for gas chromatography
Autor: K. Grob, Willi Walther, G. Grob, Wolfgang Blum
Publikováno v: Journal of Chromatography A. 244:197-208
A critical comparison of commercial with laboratory-mad columns has revealed important new facts. Whereas commercial columns are now preferentially made of fused silica, there are strong arguments for retaining glass for laboratory- mad capillary col
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::46e2ef2aaba2f7911de25c896396e54b
https://doi.org/10.1016/s0021-9673(00)85682-4
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9
Determination of the diastereomers of vitamin K1
Autor: Max Schmid, Max Vecchi, F. Gerber, Willi Walther
Publikováno v: Journal of High Resolution Chromatography. 4:257-259
A method is described for the gas-chromatographic determination of the diastereomers of vitamin K1 (phylloquinone) in the form of their dihydro dimethyl ethers. The reported method of derivatization and chromatographic analysis in conjunction with op
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::3b8212e4d71dd346f34dd2d922ce03d7
https://doi.org/10.1002/jhrc.1240040602
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