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    Search term:"deprotonations"

    23 matches found for deprotonations

    Switchable RAFT Agents

    Article prepared by: Jeremy Bartels, Ph.D. and Sebastian Grajales, Ph.D. Aldrich Materials Science, 6000 N. Teutonia Ave. Milwaukee, WI 53209 Introduction to Switchable RAFT Agents Reversible Addition/Fragmentation chain Transfer (RAFT) polymerization (RAFT Polymerization Introduction) is a versatil...

    BASIL™—BASF’s Processes Based on Ionic Liquids

    • • Download PDF • BASF Aktiengesellschaft, 67056 Ludwigshafen, Germany, www.basf.de/new-intermediates. Currently, the most important application of Ionic Liquids described is their use as reaction media for chemical processes. A major breakthrough was reached with BASF’s introduction of the first a...

    Chiral Amines

    • • Download PDF • Chiral amines have found widespread application in asymmetric synthesis serving, for instance, as chiral bases in enantioselective deprotonation reactions1 or being valuable substances for resolving racemic mixtures of acids. Additionally, chiral amines are prevalent, essential pa...

    Selective 1,2-Additions with LaCl3·2LiCl

    While the 1,2-addition of Grignard reagents to ketones is undoubtedly a powerful transformation, oftentimes selectivity issues arising from competitive alpha-deprotonation detract from the use of these reagents. Various methods have been developed to address this shortcoming, including the use of Ce...

    Tetrameric Phosphazene Bases

    Vol. 3, No. 1 Strong and Hindered Bases in Organic Synthesis Download a PDF version Introduction / Phosphazene Bases / Verkade's Superbases / Traditional bases Preservation of Reagents / Aldrich Schlenk-Type Glassware Phosphazene Bases Introduction / Monomeric Phosphazene Bases (P1) Dimeric Phosphaz...

    Gold Catalysts

    Prior to the 1980s, gold was regarded as having little catalytic activity. Recent advancements, spearheaded by F. Dean Toste (University of California, Berkeley) and others, have propelled gold into the forefront of transition metal catalysis. In particular, phosphine-ligated gold(I) complexes have ...

    BASIL™—BASF’s Processes Based on Ionic Liquids | Technical Article

    Dr. Matthias Maase, Dr. Klemens Massonne, Dr. Uwe Vagt, BASF Aktiengesellschaft, 67056 Ludwigshafen, Germany, www.basf.de/new-intermediates. Currently, the most important application of Ionic Liquids described is their use as reaction media for chemical processes. A major breakthrough was reached wi...

    Dimeric Phosphazine Bases

    Vol. 3, No. 1 Strong and Hindered Bases in Organic Synthesis Download a PDF version Introduction / Phosphazene Bases / Verkade's Superbases / Traditional bases Preservation of Reagents / Aldrich Schlenk-Type Glassware Phosphazene Bases Introduction / Monomeric Phosphazene Bases (P1) Dimeric Phosphaz...

    Product Highlights for Organic and Inorganic Synthesis Archive

    By Application Area Cross-Coupling • Bis-Hydroxamic Acid (BHA) Ligands – New Chiral Ligands for Asymmetric Oxidation (2009) • BRIDP from Takasago - New Ligands for Cross-Coupling Catalysis (2008) • MIDA Boronates (2008) • Symphos Ligands for Efficient Suzuki Cross-Coupling (2008) • cataCXium®—Ligand...

    High Affinity Polyvalent Nanoether SAMs on Gold: Why More is Better

    • • Download PDF • SensoPath Technologies, Inc. Self-assembled monolayers or SAMs of thiols and organic disulfides on gold surfaces were described by Nuzzo and Allara in 19831 as a considerable improvement over difficult to maintain Langmuir-Blodgett monolayers. Extensive studies by these authors an...

    New Reagents for Selective Metalation, Deprotonation, and Additions

    Introduction Over the last several years, Knochel and coworkers have reported reagents for selective metalation, deprotonation and nucleophilic additions. These reagents have transformed the field, allowing for unprecedented selective conversions to reactive intermediates within a molecule which con...

    HKR Epoxides

    Aldrich ChemFiles 2005, 5.4, 17. One of the most effective and recent methods for obtaining several classes of chiral building blocks is Jacobsen’s hydrolytic kinetic resolution technique (HKR). The method provides general access to many chiral epoxides and 1,2-diols that are otherwise difficult to ...

    Gold Catalyst in Chemical Synthesis

    Introduction Hashmi, Toste, Echavarren, and Haruta, among others, have fueled the advance of gold into the forefront of transition metal catalysis.1,2 Phosphine ligated gold(I) complexes have risen as powerful C–C, C–N, and C–O bond forming catalysts due to the ease with which they can activate C=C ...

    Method for Introducing Sulfur Linkages

    Aldrich ChemFiles 2010, 10.3, 11. Matzger and co-workers developed a useful method for the introduction of sulfur linkages using Bu3SnSSnBu3 in the preparation of oligothienoacenes. Historically, the preparation of these molecules has been limited and not feasible for longer chain thienoacenes. The ...

    Synthetic Reagents Electrochemical Allylic Oxidation (TCNHPI)

    Professor Phil Baran and coworkers have developed a new reagent, N-Hydroxytetrachlorophthalimide (ALD00564), which provides a cheap, scalable, and safe synthetic alternative to highly used transformations like allylic oxidations, as well as Negishi and Suzuki–Miyaura type cross-coupling reactions. I...

    Vol 3 No 1

    Vol. 3, No. 1 Strong and Hindered Bases in Organic Synthesis Download a PDF version Introduction / Phosphazene Bases / Verkade's Superbases / Traditional bases Preservation of Reagents / Aldrich Schlenk-Type Glassware Bases are a very important class of reagents for synthetic organic chemistry, as i...

    Monomeric Phosphazene Bases

    Vol. 3, No. 1 Strong and Hindered Bases in Organic Synthesis Download a PDF version Introduction / Phosphazene Bases / Verkade's Superbases / Traditional bases Preservation of Reagents / Aldrich Schlenk-Type Glassware Phosphazene Bases Introduction / Monomeric Phosphazene Bases (P1) Dimeric Phosphaz...

    Stimuli-Responsive Materials as Intelligent Drug Delivery Systems

    Amit Singh and Mansoor M. Amiji* Department of Pharmaceutical Sciences, School of Pharmacy Northeastern University, Boston, MA 02115 USA *Email: m.amiji@neu.edu; Tel: 617-373-3137 Materials science has revolutionized the central paradigm of drug delivery, especially for cancer therapeutics, such tha...

    New Reagents for Selective Metalation, Deprotonation, and 1,2-Additions

    Aldrich ChemFiles 2010, 10.1, 12. Selective Metalations using i-PrMgCl•LiCl and s-BuMgCl•LiCl While halogen-metal exchange reactions are among the most common methods for preparing organometallic reagents, Li-halogen exchange reactions typically require low temperatures and offer limited compatibili...

    Frost Group - Professor Product Portal

    Professor Product Portal Index Professor Brian Frost The Frost group has a longstanding interest in aqueous phase organometallic chemistry with an emphasis on water-soluble phosphine ligands. One focus of this research group has been centered on the chemistry of the neutral, air stable, and water-so...

    RAFT Polymerization Lecture Video - Materials Science

    Dr. Ezio Rizzardo, Chief Scientist at the Commonwealth Scientific and Industrial Research Organization (CSIRO), presents an overview of Reversible Addition Fragmentation Chain Transfer (RAFT) Polymerization and highlighting recent advances, such as switchable RAFT agents. In the lecture, Dr. Rizzard...

    Super Silyl Protecting Groups – Unique Reactivity in C–C Bond Forming Reactions

    • Introduction • Representative Applications • Products Tris(trimethylsilyl)silane, 360716 (Figure 1) won the Fluka Reagent of the Year award in 1990 for its use as an alternative to tributylstannane (Bu3SnH) in radical reactions. Tris(trimethylsilyl)silane has been used in hydrosilylations,1 radica...

    Phosphazene Bases

    Activation of an organic substrate with an acidic C-H bond by strong bases is a key process in organic synthesis. Many of the most common organic reactions such as elimination, alkylation, Michael addition, silylation, and aldol condensation are base-catalyzed, and the determination of the appropria...