Výsledky vyhledávání - "Gunther Snatzke"

Autor: Gizachew Alemayehu, Gunther Snatzke, Helmut Duddeck, Berhanu M. Abegaz

Publikováno v: Phytochemistry. 32:1273-1277

Eleven anthracene and naphthalene derivatives were isolated and identified from the leaves and root bark of S. longiracemosa . Three of the isolated compounds: 1,8,1′,8′-tetrahydroxy-6′-methoxy-3,3′-dimethyl-(10,10′-bianthracen)-9,9′-dion

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::c60d0d6de4b439f0d52b3fb5770fe7bd
https://doi.org/10.1016/s0031-9422(00)95104-5

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Stereochemical Studies of some 12a-Substituted Rotenoid Derivatives

Autor: Ivanka Kostova, Nikolina Berova, Petko Ivanov, Bozhana Mikhova, Rositza Rakovska, Gunther Snatzke

Publikováno v: Croatica Chemica Acta
Volume 64
Issue 4

The absolute configuration at 6a and 12a positions as well as the conformation of rings B and C of some cis fused 12a-substituted (OH, CH2OH, CH2OCOR’) synthetic derivatives of natural rotenoids, rotenone and amor- phigenin, are discussed on the ba

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https://hrcak.srce.hr/137272

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Heptamolybdate Ion Catalyzed Epimerization of Monosaccharides. CD Study of Binding of Monosaccharides and Polyols to Molybdate and Tungstate

Autor: Gunther Snatzke, Jia Guo, Zlata Raza, Vitomir Šunjić

Publikováno v: Croatica Chemica Acta
Volume 64
Issue 3

Conformational properties and weak interactions of monosaccharides in the oxo-complexes with ammonium heptamolybdate (AHM) and ammonium paratungstate (APT) are studied by the CD spectroscopy, and their relation to the catalytic C(2) epimerization ste

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https://hrcak.srce.hr/137329

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Photoelastic modulator for the mid‐IR range down to 33 μm with inexpensive and simple control electronics

Autor: Günter Georg Hoffmann, Gunther Snatzke, Bernhard Schrader

Publikováno v: Review of Scientific Instruments. 58:1675-1677

The construction of a photoelastic modulator is described which is intended to push the long wavelength limit of infrared circular dichroism measurements down to about 300 cm−1 (33 μm). A simple electronic circuit has been designed to drive the de

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https://doi.org/10.1063/1.1139656

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Circular Dichroism of Bufadienolides

Autor: Brian Green, Feliksa Snatzke, Gunther Snatzke, George R. Pettit, Yoshiaki Kamano, Margaret L. Niven

Publikováno v: Croatica Chemica Acta
Volume 58
Issue 4

With the help of PMO theory a non-empirical sector rule has been derived for the n ~ 1t5* band CD (around 260 nm) of the pentadienolide chromophore of steroidal bufadienolides. The rule was verified by experiment using the preferred conformation for

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https://hrcak.srce.hr/file/262354

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Synthesis of Some Optically Active α-Pyridyl-carbinols and Determination of Absolute Configuration from the CD of Their in situ Complexes with [MO2(OAc)4 ]

Autor: Nikolina Berova, Stefan Bojadziev, Rosiza Rakovska, Jadwiga Frelek, Gunther Snatzke

Publikováno v: Croatica Chemica Acta
Volume 62
Issue 2B

Four new a-pyridyl-aryl-carbinols have been synthesized, and twelve such racemates have been for the first time resolved by standard procedures. From the positive CD-couplet of the complex between (S)-l and 23 an antiperiplanar arrangement of the H-C

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https://hrcak.srce.hr/175507

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Chiroptical Properties of Optically Active Thiazolidines Derived from Aldoses and Natural Mercapto-amino Acids

Autor: Zoltan Gyorgydeak, Albert Levai, Gunther Snatzke

Publikováno v: Croatica Chemica Acta
Volume 60
Issue 2

Optically active thiazolidines substituted at C(2) or/and C(4) show at least 2 Cotton effects below 260 nm, and different correlations between stereochemistry and CD hold for these compounds and their N-acyl derivatives. By such N-acylation all CD- -

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https://hrcak.srce.hr/176346

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An Absolute Configuration of (lR, 4R, 5R)-4-Methoxy-8-acetyl- 7, 7-dimethyl-6-thia-3,8-diazabicyclo[3.2.1. ]octan-2-one, C10H16N203S

Autor: Biserka Kojić-Prodić, Živa Ruzić-Toroš, Gunther Snatzke, Jure J. Herak

Publikováno v: Croatica Chemica Acta
Volume 57
Issue 4

The crystal and molecular structure of the title compound was determined; its absolute configura 3a (I)] . The conformation of the dicnabicyclo (3.2.1] octane ring is boat-envelope-chair. Molecules are connected in an infinite chain by hydrogen bonds

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https://www.bib.irb.hr/1161708

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Circular Dichroism of Optically Active 1,2-Disubstituted 1,2-Diphenyl Ethanes. Part III. Compounds with a COOR-group at Benzylic C

Autor: Nikolina Berova, Bogdan Kurtev, Gunther Snatzke

Publikováno v: Croatica Chemica Acta
Volume 60
Issue 2

Optically active 1,2-diphenyl ethanes containing a COOR - group on one of the benzylic C-atoms give a relatively strong n ~]1;* - Cotton effect around 225 nm in addition to those found for 1,2-diphenyl ethanes lacking this type of substitution, and f

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https://hrcak.srce.hr/file/260053

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Circular Dichroism of Optically Active 1,2-Disubstituted 1,2-Diphenyl Ethanes Part II: Compounds without COOR-group at Benzylic C

Autor: N. Berova, B. Kurtev, Gunther Snatzke

Publikováno v: Croatica Chemica Acta
Volume 58
Issue 2

(R,R)-Hydrobenzoin and homochirally analogous thTeo-compounds of formula Ph-CHX-CHY-Ph (X = Y; X rO Y; Y = H) show anegative O-O - CD-line below 37200 crn? and/er a positive one just above it, which can be explained by conformational equilibria aroun

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https://hrcak.srce.hr/177754

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