Zobrazeno 1 - 10 of 11 pro vyhledávání: '"Andreas Kusche"'
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Chiral Organometallic Reagents, XI. Stereoselective Exchange of Diastereotopic Iodine Atoms by Magnesium in 3‐Alkoxy‐1,1‐diiodoalkanes
Autor: Andreas Kusche, Reinbard W. Hoffmann
Publikováno v: Chemische Berichte. 127:1311-1316
α-Iodoalkylmagnesium species were generated by reaction of 3-oxygenated 1,1-diiodoalkanes with isopropylmagnesium halides at −78%C. The resulting magnesium carbenoids were found to be configurationally stable at temperatures up to −20%C and were
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::9c416b3c17afc41a0c9adfba9a666787
https://doi.org/10.1002/cber.19941270721
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5
Chiral Organometallic Reagents, IX. On the Origins of the Diastereoselectivity in the Bromine/Lithium Exchange of 3–Alkoxy–1,1–dibromoalkanes
Autor: Martin Bewersdorf, Reinhard W. Hoffmann, Karen Brumm, Wolfgang Mikolaiski, Andreas Kusche
Publikováno v: Chemische Berichte. 125:2741-2747
The 3–alkoxy–1,1–dibromopentanes 5 are compounds, which according to MM2 calculations populate one conformation to >80% at −110°C. On reaction with n-butyllithium the bromine atom which resides in the extended position is exchanged with sele
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::26f1d44aa187eaf2e2c737848cd387c6
https://doi.org/10.1002/cber.19921251220
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8
A direct synthesis of O,S-acetals from aldehydes
Autor: Andreas Kusche, Ingo Münster, Rolf Hoffmann, Petra Keiner, Reinhard Brückner
Publikováno v: Tetrahedron Letters. 32:467-470
In the presence of catalytic to stoichiometric amounts of trimethylsilyl triflate, 1:1:1 mixtures of silyl ethers, phenyl(trimethylsilyl)sulfide, and aldehydes give O,S-acetals in fair to good yields.
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::23ec57b798ca292bc6b561e3d25d2056
https://doi.org/10.1016/s0040-4039(00)79470-6
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9
Künstliche molekulare Anion‐Wirte. Die Synthese eines chiralen bicyclischen Guanidinium‐Salzes als funktionalisierte Ankergruppe für Oxo‐Anionen
Autor: Klaus Harms, Alexander Gleich, Andreas Kusche, Stefan W. Scheuplein, Reinhard Brückner, Franz P. Schmidtcher
Publikováno v: Chemische Berichte. 123:907-915
Artificial Molecular Anion Hosts. Synthesis of a Chiral Bicyclic Guanidinium Salt Serving as a Functionalized Anchor Group for 0x0 Anions Starting from 1-asparagine, the synthesis of the S,S-bis(hydroxymethyl)-substituted bicyclic guanidinium salt 3
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::4cdf3c53244abb50196e24778fce93f5
https://doi.org/10.1002/cber.19901230442
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10
Asymmetric Induction in the [2,3] Witting Rearrangement by Chiral Substituents in the Allyl Moiety: 1,3‐Asymmetric Induction
Autor: Klaus Harms, Reinhard Brückner, Andreas Kusche, Stefan W. Scheuplein
Publikováno v: Chemische Berichte. 123:917-925
Witting rearrangement of he type45 can exhibit stereocontrol due to asymmetric induction. The Wittig-still rearrangements of stannylated ethers (E)-10 and (Z)-10 are stereochemically complementary and furnish the homoallylic alcohols anti-11 and syn-
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::cdbf6ed7a24bd42d57d0a40dba8189e2
https://doi.org/10.1002/cber.19901230443
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