Výsledky vyhledávání - "Theo Zweifel"

Taming the Friedel-Crafts Reaction: Organocatalytic Approach to Optically Active 2,3-Dihydrobenzofurans

Autor: Lars Krogager Ransborg, Theo Zweifel, Karl Anker Jørgensen, Mette Overgaard, Łukasz Albrecht, Vibeke Henriette Lauridsen

Publikováno v: Albrecht, L K, Ransborg, L K, Lauridsen, V, Overgaard, M K, Zweifel, T & Jørgensen, K A 2011, ' Taming the Friedel-Crafts Reaction – An Organocatalytic Approach to Optically Active 2,3-Dihydrobenzofurans ', Angewandte Chemie International Edition, vol. 50, no. 52, pp. 12496-12500 . https://doi.org/10.1002/anie.201105819

Fine-tuning: Three types of optically active trans-2,3-disubstituted-2,3-dihydrobenzofurans having three contiguous stereogenic centers can be efficiently accessed by one-pot reaction cascades (see scheme; TMS = trimethylsilyl). High substitution div

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4ead618c10f959a8b649fc10e09e4186
https://doi.org/10.1002/ange.201105819

Zobrazit plný text záznamu

Asymmetric Organocatalytic Monofluorovinylations

Autor: Theo Zweifel, Karl Anker Jørgensen, Christian Borch Jacobsen, Dennis Worgull, Esben Fisker, Martin Nielsen

Publikováno v: Jacobsen, C B, Nielsen, M, Worgull, D, Zweifel, T, Fisker, E & Jørgensen, K A 2011, ' Asymmetric organocatalytic monofluorovinylations ', Journal of the American Chemical Society, vol. 133, no. 19, pp. 7398-7404 . https://doi.org/10.1021/ja110624k

The development of highly enantio- and diastereoselective organocatalytic monofluorovinylations is presented. Based on the application of α-fluoro-β-keto-benzothiazolesulfones, the formal addition of a monofluorovinylic anion synthon to a range of

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::24552b5be5cc5d5b1df19a5f57609544
https://doi.org/10.1021/ja110624k

Zobrazit plný text záznamu

Practical Synthesis of β-Carbonyl Phenyltetrazolesulfones and Investigations of Their Reactivities in Organocatalysis

Autor: Martin Nielsen, Theo Zweifel, Karl Anker Jørgensen, Christian Jacobsen, Jacob Overgaard

Publikováno v: Zweifel, T, Nielsen, M, Overgaard, J, Jacobsen, C B & Jørgensen, K A 2011, ' Practical Synthesis of β-Carbonyl Phenyltetrazolesulfones and Investigations of Their Reactivities in Organocatalysis ', European Journal of Organic Chemistry, vol. 2011, no. 1, pp. 47-52 . https://doi.org/10.1002/ejoc.201001426

A practical synthesis of β-carbonyl phenyltetrazolesulfones, useful for a series of enantioselective reactions, is shown. Aryl, alkyl and ester carbonyl compounds all proved to be efficiently synthesised, leading to products in up to >99 % yield ove

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::18b275e9438d4055007c9fd25ce7117b
https://doi.org/10.1002/ejoc.201001426

Zobrazit plný text záznamu

Catalytic Aerobic Dehydrogenative Coupling of Primary Alcohols and Water to Acids Promoted by a Rhodium(I) Amido N-Heterocyclic Carbene Complex

Autor: Samuel P. Annen, Federica Ricatto, Hansjörg Grützmacher, Theo Zweifel

Publikováno v: CHEMCATCHEM

The amino diolefin complex [Rh(trop 2 NH)(TMIY)] + (OTf) (OTf - = CF 3 SO 3 - ; trop=5-H-dibenzo[a,d]cyclohepten-5yl), incorporating N-heterocyclic carbene ligand 1,3,4,5-tetramethylimidazole-2-ylidene (TMIY), has been prepared. The structure is dete

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1801c83da127c76fb5ade501579d1bc7
https://doi.org/10.1002/cctc.201000100

Zobrazit plný text záznamu

Chiral [Bis(olefin)amine]rhodium(I) Complexes – Transfer Hydrogenation in Ethanol

Autor: Timo Ott, Theo Zweifel, David Scheschkewitz, Matthias Vogt, Hansjörg Grützmacher

Publikováno v: European Journal of Inorganic Chemistry. 2009:5561-5576

Bis(olefin)amines (boas) are a new class of ligands for the synthesis of transition metal complexes, which can be used in various homogeneous catalytic reactions. A simple straightforward coupling reaction between 5H-dibenzo[a,d]cyclohepten-5-yl chlo

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::c4e7b06ffbea18a78f19f5d5097aab37
https://doi.org/10.1002/ejic.200900875

Zobrazit plný text záznamu

Catalyzed Dehydrogenative Coupling of Primary Alcohols with Water, Methanol, or Amines

Autor: Theo Zweifel, Jean-Valère Naubron, Hansjörg Grützmacher

Publikováno v: Angewandte Chemie International Edition. 48:559-563

A working partnership: Metal-ligand cooperativity is responsible for the high activity of the rhodium amido complex 1 in the dehydrogenative coupling of primary alcohols with water, methanol, or amines, including ammonia (see scheme), to give carboxy

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::64357ec341ef5a05545a3b6863f6c036
https://doi.org/10.1002/anie.200804757

Zobrazit plný text záznamu

Vyhledávací nástroje:

Upřesnit hledání