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pro vyhledávání: '"M R Van Calsteren"'
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Publikováno v:
Canadian Journal of Chemistry. 83:1098-1113
The selective HNO3 nitration of di-n-octylcrown-6 calix[4]arene using different conditions, studied with LCMS and NMR (1H and 13C) spectroscopic techniques, lead to the identification of most of the expected nitro derivative isomeric compounds. The
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b68d7bbec5c3d2ea6cf90f2c36442a2b
https://doi.org/10.1139/v05-126
https://doi.org/10.1139/v05-126
Publikováno v:
Journal of Agricultural and Food Chemistry. 48:1455-1461
Crocin-a water soluble carotenoid-is found in the fruits of gardenia (Gardenia jasminoides Ellis) and in the stigmas of saffron (Crocus sativus Linne). For crocin purification, gardenia fruits are extracted with 50% acetone, followed by ether washing
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::362652081e86f7486d9c9b3b97cf0fd5
https://doi.org/10.1021/jf991263j
https://doi.org/10.1021/jf991263j
Autor:
Simón Hernández-Ortega, L. Torres-Colín, Manuel Jiménez-Estrada, Andre Aumelas, E. Cristobal-Telésforo, C. K. Jankowski, M R Van Calsteren, Ricardo Reyes-Chilpa
Publikováno v:
Scopus-Elsevier
Two novel compounds, celastroidine A (1) and B (2), were isolated from the roots of Hippocratea celastroides K. Their structures were elucidated by spectroscopical and X-ray diffraction studies. Celastroidine A (1) (C50H74O5) was identified as a Diel
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::74857910f1020257191b9f06cce438c1
https://doi.org/10.1139/v99-239
https://doi.org/10.1139/v99-239
Autor:
Raymundo Cruz-Almanza, L.D. Miranda, David Corona, E. Diaz-Torres, A. Fuentes, R. Lopez-Castañares, K. Jankowski, M R Van Calsteren
Publikováno v:
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy. 55:1035-1048
In this paper we report the synthesis and spectral analysis of new heterocyclic derivatives of 4-aryl thieno[3,2-c]pyridines. These functionalized compounds were obtained from heteroaromatic aldehyde derivative and a cyclisation via tandem aza–Witt
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f06802ae23c0e6f28b8d5315857ae388
https://doi.org/10.1016/s1386-1425(98)00249-2
https://doi.org/10.1016/s1386-1425(98)00249-2
Publikováno v:
Natural Product Letters. 12:181-190
The revision of trinervinol (1) structure, a tricyclic diterpene isolated from Piqueria trinervia cav., led to the modification of the double bond position as well as to the inversion of configuration at glycol and possible hydroxymethylene moieties
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::68228b2123fe9fd56882a1ede5d97de6
https://doi.org/10.1080/10575639808048289
https://doi.org/10.1080/10575639808048289
Publikováno v:
Spectroscopy Letters. 29:87-99
X-ray structure analysis is discussed in order to probe the information about the conformational behaviour of compound 1.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c6a01be4c5cc11bf9e88bec260e2cf9e
https://doi.org/10.1080/00387019608001583
https://doi.org/10.1080/00387019608001583
Autor:
Angel Guzman, J. M. Muchowski, M R Van Calsteren, Edvige Galeazzi, J. L. Nava, K. Jankowski, Eduardo Díaz
Publikováno v:
Magnetic Resonance in Chemistry. 33:581-585
The conformation of 1-phenyl-1-(1,2-dimethyl-5-pyrrolyl)-2-(2-methyl-5-benzoyl-1-pyrroly)ethanol, with characteristics of a molecular propeller, is stabilized by intramolecular hydrogen bonding as detected by 1H NMR, NOE difference experiments, 2D NM
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::39fe499e11718fd6c765a264a1cec347
https://doi.org/10.1002/mrc.1260330715
https://doi.org/10.1002/mrc.1260330715
Publikováno v:
Magnetic Resonance in Chemistry. 32:321-325
High-field 2D NMR studies were performed on nine neo-clerodane diterpenoids. Unambiguous assignments of the 13 C signals and proton chemical shifts were achieved which led to the revision of some previous assignments
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4c62506092cb7131e1923c29b5a720f6
https://doi.org/10.1002/mrc.1260320602
https://doi.org/10.1002/mrc.1260320602
Autor:
William F. Reynolds, C. K. Jankowski, Héctor Barrios, M. R. Van Calsteren, Eduardo Díaz, J. L. Aguilera, Francisco Yuste
Publikováno v:
ChemInform. 24
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0d63c3e4191b5a8462a2620970a69d5e
https://doi.org/10.1002/chin.199334170
https://doi.org/10.1002/chin.199334170