Zobrazeno 1 - 10
of 92
pro vyhledávání: '"Uwe Bergsträsser"'
Publikováno v:
Acta Crystallographica Section E, Vol 67, Iss 8, Pp o2061-o2061 (2011)
The title compound, C10H19NO3, is a disubstituted piperidine bearing substituents in two equatorial positions. One of the substituents is a hydroxy group bound to nitrogen and the second a tert-butyl ester group bound to the carbon next to the endocy
Externí odkaz:
https://doaj.org/article/bcbf962467294606a95ccc5b71af2ba6
Publikováno v:
Acta Crystallographica Section E, Vol 66, Iss 5, Pp o1013-o1013 (2010)
The heterocyclic core of the title compound, C10H17NO5, adopts a chair conformation with its three C substituents positioned equatorially. In the crystal, intermolecular O—H...N hydrogen bonds between neighbouring molecules lead to chains along b.
Externí odkaz:
https://doaj.org/article/7bd6bb18d8d54331aad6f75024f290fc
Publikováno v:
Inorganica Chimica Acta. 420:120-134
cis-2,6-Bis-(methanolate)-piperidine oxovanadium(V) complexes are Lewis acids able to catalyze oxidative cyclization of alkenols by tert-butyl hydroperoxide (TBHP). Terminal dimethyl-substituted (prenyl-type) 4-pentenols bearing an alkyl or a phenyl
Autor:
Oliver Brücher, Uwe Bergsträßer, Ingrid Svoboda, Jens Hartung, Marco Greb, Hartmut Fuess, Harald Kelm
Publikováno v:
Tetrahedron. 68:6968-6980
A cascade, composed of (i) oxovanadium(V)-catalyzed oxidation of bromide by tert-butyl hydroperoxide and (ii) stereoselective 6-endo-bromocyclization, affords 3-bromo-2-aryl-2,6,6-trimethyltetrahydropyrans from styrene-type tertiary alkenols in synth
Publikováno v:
Tetrahedron: Asymmetry. 22:752-760
Heterocyclic phosphorous acid chlorides, prepared from C2-symmetric menthyl, borneyl, or fenchyl tartrates and phosphorus trichloride, are inexpensive derivatizing agents for determining the enantiomeric purity of alcohols via phosphorus NMR. The mos
Publikováno v:
Tetrahedron. 67:2338-2347
This study deals with the synthesis of tert-O-alkyl thiohydroxamates and their use as tert-alkoxyl radical precursors. tert-Alkoxyl radicals were applied in mechanistic studies to determine rate constants of (i) p-chlorocumyloxyl radical addition to
Autor:
Sabine Altermann, Thomas Gottwald, Georg Stapf, Jens Hartung, Christine Schur, Irina Kempter, Markus Heubes, Uwe Bergsträßer
Publikováno v:
Tetrahedron. 65:7527-7532
Experimentally determined barriers to O-acyl group topomerization in mixed anhydrides composed of β-disubstituted carboxylic acids and cyclic thiohydroxamic acid N-hydroxy-4-methylthiazole-2(3H)-thione were located in the range of ΔG‡320=68±8 kJ
Autor:
Kristina Daniel, P. Schmidt, Nina Schneiders, Ingrid Svoboda, Uwe Bergsträßer, Jens Hartung, Steffen Danner, Irina Kempter, Hartmut Fuess
Publikováno v:
European Journal of Organic Chemistry. 2009:4135-4142
Synthetic, spectroscopic, and structural investigations provided evidence that distinguished neat 3-alkoxy-4-(p-chlorophenyl)-1,3-thiazole-2(3H)-thiones (CPTTORs), once developed to serve as alkoxyl radical precursors for storage and use on demand, s
Autor:
Ingrid Svoboda, Uwe Bergsträßer, Nina Schneiders, Kristina Daniel, Hartmut Fuess, Jens Hartung
Publikováno v:
Tetrahedron. 65:2567-2573
Bond angles at thiohydroxamate oxygen in crystal structures of 3-alkoxy-5-(p-methoxyphenyl)-4-methylthiazole-2(3H)-thiones gradually increased with the size of the 3-alkoxy substituent. This effect was attributed to strain on the basis of (i) a linea
Publikováno v:
Angewandte Chemie International Edition. 42:1863-1866