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Open Access(Thio)urea containing quaternary ammonium salts for the CO2-fixation with epoxides
A detailed screening of differently substituted chiral and achiral (thio)urea-containing quaternary ammonium salts revealed their potential as catalysts for the CO2-fixation with epoxides to obtain cyclic carbona...
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Happy birthday Heinz Falk
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Open AccessCationic Polymers Bearing Quaternary Ammonium Groups-Catalyzed CO2 Fixation with Epoxides
A series of cationic polymers containing quaternary ammonium groups turned out to be powerful catalysts for the CO2-fixation of epoxides under an atmospheric pressure of CO2 at elevated temperature. A variety of ...
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Special Issue on Heterocyclic Chemistry
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Open AccessProgress in the synthesis of δ-sultones
Sultones, the cyclic esters of hydroxyl sulfonic acids, are a fascinating class of heterocycles and the recent years have witnessed an increasing interest in these molecules, especially in six-ring δ-sultones....
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Open AccessOn the origin of the stereoselectivity in chiral amide-based ammonium ylide-mediated epoxidations
Detailed DFT studies provide an in-depth mechanistic understanding for the use of chiral amide-based ammonium ylides in epoxidation reactions. It is shown that the used chiral auxiliary efficiently shields one...
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Asymmetric α-chlorination of β-ketoesters using bifunctional ammonium salt catalysis
Chiral urea-quaternary ammonium salt hybrid organocatalysts were tested for their capability to control asymmetric α-chlorination reactions of β-ketoesters. After a careful screening we identified a structural...
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Article
Thin layer chromatography–spray mass spectrometry: a method for easy identification of synthesis products and UV filters from TLC aluminum foils
A straightforward procedure for direct mass spectrometric (MS) analysis of spots from thin layer chromatography (TLC) plates, without the need of an external ion source, was developed using the aluminum plate ...
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Article
Photoreactive, water-soluble conjugates of hypericin with polyphosphazenes
The naturally occurring drug hypericin has invoked much interest in a wide variety of biomedical applications as an antiviral, antibacterial, or antitumor agent, as well as its use as a photosensitizer for pho...
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Book
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Conclusions
The field of natural product syntheses has been dominated by (transition-) metal catalyzed asymmetric reactions for decades. However, besides the very broad range of different transformations that can be achie...
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Chapter
Introduction
The field of natural product syntheses has been dominated by (transition-) metal catalyzed asymmetric reactions for decades. However, besides the very broad range of different transformations that can be achie...
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Chapter
Singly Occupied Molecular Orbital (SOMO) Catalysis
The field of natural product syntheses has been dominated by (transition-) metal catalyzed asymmetric reactions for decades. However, besides the very broad range of different transformations that can be achie...
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Chapter
Asymmetric Oxidations and Reductions
The field of natural product syntheses has been dominated by (transition-) metal catalyzed asymmetric reactions for decades. However, besides the very broad range of different transformations that can be achie...
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Chapter
Combined Iminium-Enamine Catalyzed Approaches
The field of natural product syntheses has been dominated by (transition-) metal catalyzed asymmetric reactions for decades. However, besides the very broad range of different transformations that can be achie...
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Chapter
Asymmetric Phase-Transfer Catalysis
The field of natural product syntheses has been dominated by (transition-) metal catalyzed asymmetric reactions for decades. However, besides the very broad range of different transformations that can be achie...
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Chapter
Iminium Catalysis
The field of natural product syntheses has been dominated by (transition-) metal catalyzed asymmetric reactions for decades. However, besides the very broad range of different transformations that can be achie...
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Chapter
Chiral Brønsted Acids and Hydrogen Bonding Donors
The field of natural product syntheses has been dominated by (transition-) metal catalyzed asymmetric reactions for decades. However, besides the very broad range of different transformations that can be achie...
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Chapter
Enamine Catalysis
The field of natural product syntheses has been dominated by (transition-) metal catalyzed asymmetric reactions for decades. However, besides the very broad range of different transformations that can be achie...
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Chapter
Chiral Brønsted and Lewis Bases
The field of natural product syntheses has been dominated by (transition-) metal catalyzed asymmetric reactions for decades. However, besides the very broad range of different transformations that can be achie...
