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Silvia Elfert

University of Cologne

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Publication

Featured researches published by Silvia Elfert.

Angewandte Chemie | 2013

Characterization of the Key Intermediates of Carbene‐Catalyzed Umpolung by NMR Spectroscopy and X‐Ray Diffraction: Breslow Intermediates, Homoenolates, and Azolium Enolates

Albrecht Berkessel; Veera Reddy Yatham; Silvia Elfert; Jörg-M. Neudörfl

Caught in the act: Diamino enols, diamino dienols, azolium enolates, and azolium enols are postulated intermediates of the N-heterocyclic carbene catalyzed umpolung of aldehydes and enals. Several of these elusive reaction intermediates were generated with the saturated imidazolidin-2-ylidene SIPr (R=2,6-bis(2-propyl)phenyl) and characterized by NMR spectroscopy and X-ray crystallography.

Angewandte Chemie | 2010

Aldehyde Umpolung by N-Heterocyclic Carbenes: NMR Characterization of the Breslow Intermediate in its Keto Form, and a Spiro-Dioxolane as the Resting State of the Catalytic System†

Albrecht Berkessel; Silvia Elfert; Kerstin Etzenbach‐Effers; J. Henrique Teles

Angewandte Chemie | 2012

Umpolung by N-heterocyclic carbenes: generation and reactivity of the elusive 2,2-diamino enols (Breslow intermediates).

Albrecht Berkessel; Silvia Elfert; V. Reddy Yatham; Jörg-M. Neudörfl; Nils Schlörer; J. Henrique Teles

Angewandte Chemie | 2010

Umpolung von Aldehyden mit N‐heterocyclischen Carbenen: NMR‐Charakterisierung des Breslow‐Intermediats in seiner Ketoform und eines Spirodioxolans als “resting state” des katalytischen Systems

Albrecht Berkessel; Silvia Elfert; Kerstin Etzenbach‐Effers; J. Henrique Teles

Angewandte Chemie | 2012

Umpolung mit N-heterocyclischen Carbenen: Generierung und Reaktivität von Breslow-Intermediaten (2,2-Diaminoenole)†

Albrecht Berkessel; Silvia Elfert; V. Reddy Yatham; Jörg-M. Neudörfl; Nils Schlörer; J. Henrique Teles

Angewandte Chemie | 2013

Charakterisierung der Schlüsselintermediate von carbenkatalysierten Umpolungen durch Kristallstrukturanalyse/NMR‐Spektroskopie: Breslow‐Intermediate, Homoenolate und Azoliumenolate

Albrecht Berkessel; Veera Reddy Yatham; Silvia Elfert; Jörg-M. Neudörfl

Advanced Synthesis & Catalysis | 2014

On the Involvement of a Spiroepoxide Intermediate in N‐Heterocyclic Carbene (NHC)‐Catalyzed Benzoin Condensations – An Approach by Oxygenation of Deoxy‐Breslow Intermediates

Albrecht Berkessel; Silvia Elfert

Angewandte Chemie | 2010

Titelbild: Umpolung von Aldehyden mit N‐heterocyclischen Carbenen: NMR‐Charakterisierung des Breslow‐Intermediats in seiner Ketoform und eines Spirodioxolans als “resting state” des katalytischen Systems (Angew. Chem. 39/2010)

Albrecht Berkessel; Silvia Elfert; Kerstin Etzenbach‐Effers; J. Henrique Teles

Angewandte Chemie | 2012

Cover Picture: Umpolung by N‐Heterocyclic Carbenes: Generation and Reactivity of the Elusive 2,2‐Diamino Enols (Breslow Intermediates) (Angew. Chem. Int. Ed. 49/2012)

Albrecht Berkessel; Silvia Elfert; V. Reddy Yatham; Jörg-M. Neudörfl; Nils Schlörer; J. Henrique Teles

Angewandte Chemie | 2012

Titelbild: Umpolung mit N-heterocyclischen Carbenen: Generierung und Reaktivität von Breslow-Intermediaten (2,2-Diaminoenole) (Angew. Chem. 49/2012)

Albrecht Berkessel; Silvia Elfert; V. Reddy Yatham; Jörg-M. Neudörfl; Nils Schlörer; J. Henrique Teles

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Albrecht Berkessel

University of Cologne

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J. Henrique Teles

Bosch

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Jörg-M. Neudörfl

University of Cologne

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Kerstin Etzenbach‐Effers

University of Cologne

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Nils Schlörer

University of Cologne

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V. Reddy Yatham

University of Cologne

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Veera Reddy Yatham

University of Cologne

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