Author
Eckehard V. Dehmlow
Other affiliations: Technical University of Berlin
Bio: Eckehard V. Dehmlow is an academic researcher from Bielefeld University. The author has contributed to research in topics: Catalysis & Alkylation. The author has an hindex of 16, co-authored 61 publications receiving 1607 citations. Previous affiliations of Eckehard V. Dehmlow include Technical University of Berlin.
Topics: Catalysis, Alkylation, Stereocenter, Acylation, Oxazoline
Papers published on a yearly basis
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Book•
01 Jan 1980
TL;DR: Ion Pairs and ion pair extraction as mentioned in this paper, the nature of phase transfer catalysis ion pairs in organic media Extraction of Ion Pairs from Aqueous Solution Crown Ethers, Cryptates, and Other Chelating Agents as Extractants Solid-Liquid Anion Exchange Mechanism of Phase Transfer Catalysis Mechanistic Investigations Empirical Catalyst Evaluations Unusual and Polymer Supported Catalysts Practical Applications of PTC Applications General Experimental Procedures Formation of Halides Preparation of Nitriles Ester Formation Miscellaneous Displacements Thiols and Sulfides Prepar
Abstract: Ion Pairs and Ion Pair Extraction Introduction: The Nature of Phase Transfer Catalysis Ion Pairs in Organic Media Extraction of Ion Pairs from Aqueous Solution Crown Ethers, Cryptates, and Other Chelating Agents as Extractants Solid-Liquid Anion Exchange Mechanism of Phase Transfer Catalysis Mechanistic Investigations Empirical Catalyst Evaluations Unusual and Polymer Supported Catalysts Practical Applications of Phase Transfer Catalysis General Experimental Procedures Formation of Halides Preparation of Nitriles Ester Formation Miscellaneous Displacements Thiols and Sulfides Preparation of Ethers N-Alkylations C-Alkylation of Activated CH-Bonds Alkylation of Ambident Anions Isomerizations and H/D Exchange Additions across Multiple CC-Bonds Addition to C=O and C=N Bonds b'-Eliminations Hydrolysis Reactions Generation and Conversion of Phosphonium and Sulfonium Ylides Nucleophilic Aromatic Substitution Miscellaneous Reactions Organometallic PTC Applications a'-Eliminations Reduction Reactions Oxidation Reactions References Subject Index.
744 citations
55 citations
TL;DR: In this paper, it was shown that free CX2 is more reactive and electrophilic than free CCl2 under phase transfer catalysis conditions, again contrary to literature claims, and an example of a differing mode of reaction of chloroform and bromoform was given.
45 citations
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TL;DR: Aqueous H2O2 is an ideal oxidant, when coupled with a tungstate complex and a quaternary ammonium hydrogensulfate as an acidic phase-transfer catalyst in an economically, technically, and environmentally satisfying manner.
849 citations
TL;DR: Carbenes have become ubiquitous in organometallic chemistry and their interaction with a metal center, which allows for their classification as a function of the nature of the carbene-metal bond has inspired the investigations of many research groups in every area of chemistry, from physical chemistry to organic synthesis.
801 citations
764 citations
TL;DR: The concept of atom efficiency is a useful tool for rapid evaluation of the amount of waste generated by alternative processes as mentioned in this paper, and the general theme of atom-efficient, catalytic processes is illustrated with industrially relevant examples.
Abstract: The key to waste minimization in fine chemicals manufacture is the widespread substitution of classical organic syntheses employing stoichiometric amounts of inorganic reagents with cleaner, catalytic alternatives. The E factors (by waste per kg product) of chemical processes increase dramatically on going downstream from bulk to fine chemicals and pharmaceuticals, mainly owing to the use of "stoichiometric" methods. The concept of atom efficiency is a useful tool for rapid evaluation of the amount of waste generated by alternative processes. The general theme of atom-efficient, catalytic processes is illustrated with industrially relevant examples. These include catalysis by solid acids and bases, catalytic reductions and oxidations, catalytic C-C bond formation, asymmetric catalysis, biocatalysis, and catalysis in novel media (aqueous and fluorous biphasic systems, supercritical fluids, and ionic liquids).
624 citations
TL;DR: A wide variety of asymmetric transformations catalyzed by chiral onium salts and crown ethers have been developed for the synthesis of valuable organic compounds in the past several decades, especially in recent years.
Abstract: Phase-transfer catalysis has been recognized as a powerful method for establishing practical protocols for organic synthesis, because it offers several advantages, such as operational simplicity, mild reaction conditions, suitability for large-scale synthesis, and the environmentally benign nature of the reaction system. Since the pioneering studies on highly enantioselective alkylations promoted by chiral phase-transfer catalysts, this research field has served as an attractive area for the pursuit of "green" sustainable chemistry. A wide variety of asymmetric transformations catalyzed by chiral onium salts and crown ethers have been developed for the synthesis of valuable organic compounds in the past several decades, especially in recent years.
543 citations