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Harald Wack

Johns Hopkins University

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Featured researches published by Harald Wack.

Angewandte Chemie | 1999

Eine starke Wasserstoffbrücke zu einem Amid-Stickstoffatom in einem „Amid-Protonenschwamm”: Konsequenzen für Struktur und Reaktivität

Christopher Cox; Harald Wack; Thomas Lectka

N-protonierte Amide wurden als Zwischenstufen in biologisch wichtigen Reaktionen vorgeschlagen, ihr spektroskopischer Nachweis steht allerdings noch aus. Der erste Schritt auf dem Weg zu diesem Ziel wurde nun mit dem spektroskopischen und kristallographischen Nachweis einer starken, intramolekularen H-Brucke zwischen einem geladenen Donor und einem Amid-N-Atom in „Protonenschwamm”-Derivaten 1 vollzogen; diese Wechselwirkung hat eine neuartige Reaktivitat zur Folge. TfO− = Trifluormethansulfonat.

Journal of the American Chemical Society | 2002

The Development of the First Catalyzed Reaction of Ketenes and Imines: Catalytic, Asymmetric Synthesis of β-Lactams

Andrew Edmund Taggi; Ahmed M. Hafez; Harald Wack; Brandon Young; Dana Ferraris; Thomas Lectka

Journal of the American Chemical Society | 2005

Bifunctional Lewis Acid-Nucleophile-Based Asymmetric Catalysis: Mechanistic Evidence for Imine Activation Working in Tandem with Chiral Enolate Formation in the Synthesis of β-Lactams

Meha H. Shah; Anthony Weatherwax; Harald Wack; Justine P. Roth; Thomas Lectka

Journal of the American Chemical Society | 2000

Catalytic, Asymmetric Synthesis of β-Lactams

Andrew Edmund Taggi; Ahmed M. Hafez; Harald Wack; Brandon Young; and William J. Drury; Thomas Lectka

Journal of the American Chemical Society | 2001

Catalytic, Asymmetric α-Halogenation

Harald Wack; Andrew Edmund Taggi; Ahmed M. Hafez; and William J. Drury; Thomas Lectka

Journal of the American Chemical Society | 2004

Catalytic, Asymmetric α-Chlorination of Acid Halides

Harald Wack; Andrew Edmund Taggi; Ahmed M. Hafez; Ty R. Wagerle; Meha H. Shah; Crystal L. Dusich; Thomas Lectka

Organic Letters | 2002

Bifunctional Asymmetric Catalysis: A Tandem Nucleophile/Lewis Acid Promoted Synthesis of β-Lactams

Harald Wack; Ahmed M. Hafez; Andrew Edmund Taggi; Daniel R. Witsil; Thomas Lectka

Organic Letters | 2000

Column Asymmetric Catalysis for β-Lactam Synthesis

Ahmed M. Hafez; Andrew Edmund Taggi; Harald Wack; and William J. Drury; Thomas Lectka

Organic Letters | 2001

Reactive Ketenes through a Carbonate/Amine Shuttle Deprotonation Strategy: Catalytic, Enantioselective α-Bromination of Acid Chlorides

Ahmed M. Hafez; Andrew Edmund Taggi; Harald Wack; and Julie Esterbrook; Thomas Lectka

Organic Letters | 2002

Generation of ketenes from acid chlorides using NaH/crown ether shuttle-deprotonation for use in asymmetric catalysis.

Andrew Edmund Taggi; Harald Wack; Ahmed M. Hafez; Thomas Lectka

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Thomas Lectka

Johns Hopkins University

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Ahmed M. Hafez

Johns Hopkins University

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Andrew Edmund Taggi

DuPont

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William J. Drury

Johns Hopkins University

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Brandon Young

Johns Hopkins University

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and William J. Drury

Johns Hopkins University

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Anthony Weatherwax

Johns Hopkins University

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Christopher Cox

Johns Hopkins University

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Daniel R. Witsil

Johns Hopkins University

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Meha H. Shah

Johns Hopkins University

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