Výsledky vyhledávání - "Lukas Hintermann"

Akademický článek

Structure Elucidation of a Cryptic Condensation Product from Diacetyl and Arylamine – Then and Now

Autor: Lukas Hintermann

Publikováno v: CHIMIA, Vol 74, Iss 4, Pp 293-297 (2020)

Some 70 years ago, the reaction of diacetyl (1) and arylamines (2) in hot phosphoric acid was reported to give a new type of condensation products, but no structure was assigned to them. The case is presented to recapitulate the methods and rationale

Externí odkaz: https://doaj.org/article/a34e3f283d044c76b747b344ec8c3bec

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Akademický článek

Is the tungsten(IV) complex (NEt4)2[WO(mnt)2] a functional analogue of acetylene hydratase?

Autor: Matthias Schreyer, Lukas Hintermann

Publikováno v: Beilstein Journal of Organic Chemistry, Vol 13, Iss 1, Pp 2332-2339 (2017)

The tungsten(IV) complex (Et4N)2[W(O)(mnt)2] (1; mnt = maleonitriledithiolate) was proposed (Sarkar et al., J. Am. Chem. Soc. 1997, 119, 4315) to be a functional analogue of the active center of the enzyme acetylene hydratase from Pelobacter acetylen

Externí odkaz: https://doaj.org/article/0980285756904f8ba911273d83ea03c4

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Akademický článek

Cyclization of ortho-hydroxycinnamates to coumarins under mild conditions: A nucleophilic organocatalysis approach

Autor: Florian Boeck, Max Blazejak, Markus R. Anneser, Lukas Hintermann

Publikováno v: Beilstein Journal of Organic Chemistry, Vol 8, Iss 1, Pp 1630-1636 (2012)

(E)-Alkyl ortho-hydroxycinnamates cyclize to coumarins at elevated temperatures of 140–250 °C. We find that the use of tri-n-butylphosphane (20 mol %) as a nucleophilic organocatalyst in MeOH solution allows cyclization to take place under much mi

Externí odkaz: https://doaj.org/article/0644b7257ad8486dac030540b6855530

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Akademický článek

Development of the titanium–TADDOLate-catalyzed asymmetric fluorination of β-ketoesters

Autor: Lukas Hintermann, Mauro Perseghini, Antonio Togni

Publikováno v: Beilstein Journal of Organic Chemistry, Vol 7, Iss 1, Pp 1421-1435 (2011)

Titanium-based Lewis acids catalyze the α-fluorination of β-ketoesters by electrophilic N–F-fluorinating reagents. Asymmetric catalysis with TADDOLato–titanium(IV) dichloride (TADDOL = α,α,α',α'-tetraaryl-(1,3-dioxolane-4,5-diyl)-dimethanol

Externí odkaz: https://doaj.org/article/1d66af734a144639b2a45a7edba597b7

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Akademický článek

Developing Catalytic Enantioselective Fluorination

Autor: Antonio Togni, Antonio Mezzetti, Peter Barthazy, Claus Becker, Ingrid Devillers, Richard Frantz, Lukas Hintermann, Mauro Perseghini, Maria Sanna

Publikováno v: CHIMIA, Vol 55, Iss 10 (2001)

The background that led to the development ofthe first catalytic and enantioselective carbon-fluorine bond-forming reaction is presented. Two different approaches, i.e. the use of nucleophilic and electrophilic fluorinating agents, respectively, have

Externí odkaz: https://doaj.org/article/1e204b200ded4f87896ccaab020a620d

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Akademický článek

Expedient syntheses of the N-heterocyclic carbene precursor imidazolium salts IPr·HCl, IMes·HCl and IXy·HCl

Autor: Lukas Hintermann

Publikováno v: Beilstein Journal of Organic Chemistry, Vol 3, Iss 1, p 22 (2007)

The 1,3-diaryl-imidazolium chlorides IPr·HCl (aryl = 2,6-diisopropylphenyl), IMes·HCl (aryl = 2,4,6-trimethylphenyl) and IXy·HCl (aryl = 2,6-dimethylphenyl), precursors to widely used N-heterocyclic carbene (NHC) ligands and catalysts, were prepar

Externí odkaz: https://doaj.org/article/d07cf001726c4fe986801ce2f80f2594

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