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    Search term:"cycloadditions"

    72 matches found for cycloadditions

    Diethyl Azodicarboxylate in Chemical Synthesis

    Diethyl azodicarboxylate (DEAD), a widely used reagent, is now available again from Sigma-Aldrich. Due to increased safety regulations, domestic shipment of DEAD as a dry reagent is prohibited. Sigma-Aldrich recently achieved full compliance with UN and US DOT safety regulations and is proud to offe...

    Azide Building Blocks for Chemical Ligation

    Aldrich ChemFiles 2010, 10.2, 6. Dr. Matthias Junkers Dr. Matthias Junkers Product Manager Email: matthias.junkers@sial.com Chemoselective ligation strategies are a key success factor for chemical biology research. Ligation techniques open pathways to fully synthetic large peptides and even proteins...

    Versatile Cell Culture Scaffolds via Bio-orthogonal Click Reactions

    Devising biomaterial scaffolds that are capable of recapitulating critical aspects of the complex extracellular nature of living tissues in a three-dimensional (3D) fashion is a challenging requirement in the field of tissue engineering and regenerative medicine. Hydrogels are one class of materials...

    Phosgene Application in Modern Synthesis

    Vol. 2, No. 7 Eckert's Cartridges for Safe Phosgenations Introduction / Applications / Phosgene and Substitutes / Instructions for Use / References Applications of Phosgene in Modern Synthesis Transformations Using Phosgene Phosgene is a small bifunctional molecule of high synthetic value. It is use...

    DuPhos and BPE Ligands: Highly Efficient Privileged Ligands

    Introduction Asymmetric hydrogenation reactions represent the ideal process for the commercial manufacture of single-enantiomer compounds, because of the ease by which these robust procedures can be scaled up and because of the low levels of byproducts generated in these asymmetric hydrogenations. T...

    Leighton’s Strained Silacycles: Powerful Enantioselective Allylation Reagents

    Leighton’s Strained Silacycles: Powerful Enantioselective Allylation Reagents Enantioselective allylation of aldehydes Practical, enantioselective allylation of acylhydrazones Enantioselective allylation of ketimines: synthesis of tertiary carbinamines Friedel-Crafts Alkylation with Acylhydrazones A...

    Conjugated Polymers for the Engineering of Device/Tissue Interface

    • • Download PDF • Department of Materials Science and Engineering The University of Delaware Newark, DE 19716 *Email: milty@udel.edu There is considerable interest in the development of conjugated, electronically and ionically active polymers for interfacing active biomedical devices with living ti...

    Hydroazidation Catalyst in Chemical Synthesis

    New Hydroazidation Catalyst for Facile Preparation of Organoazides The chemistry of organoazides is exceedingly rich, since the azide functionality reacts with electrophiles, nucleophiles, and dipolarophiles, with or without the extrusion of dinitrogen (Figure 1). Common place transformation such as...

    Macmillan Imidazolidinone Organocatalysts in Chemical Sythesis

    Metal-free Asymmetric Catalysis Developed by Professor David MacMillan at Caltech, imidazolidinone-based OrganoCatalysts™ are designed to serve as general catalysts for a variety of asymmetric transformations. The first highly enantioselective organocatalytic Diels-Alder reaction using (5S)-2,2,3-tr...

    Polyethylene Glycol Building Blocks for PEGylation

    • • Download PDF • Circulatory half-life is a key success factor for new drugs. In this respect, modification of potential candidates ranging from non-peptidic small molecules to peptides and proteins, antibody fragments, aptamers, and saccharides or oligonucleotides with polyethylene glycol chains ...

    David Nicewicz Group - Professor Product Portal

    Professor Product Portal Index Professor David Nicewicz The Nicewicz lab is focused on the discovery of new and powerful reaction methodologies that proceed via the intermediacy of highly reactive cation radical species. Included in these transformations are anti-Markovnikov selective additions of a...

    Functional Biomaterials Synthesized by Double-Head Polymerization Agents

    Hua Wei1 and Suzie H. Pun2* 1Department of Chemistry, Lanzhou University, Lanzhou 730000 China 2Department of Bioengineering and Molecular Engineering and Sciences Institute University of Washington, Seattle, Washington 98195 USA *Email: spun@u.washington.edu Over the past two decades, the rapid adv...

    Lithography Nanopatterning Tutorial

    Lithography Nanoimprint Lithography Soft Lithography Photochemical Acid Generators Nanopatterning Nanopatterning via Phase Separation of Polymers Self-Assembled Monolayer Systems (SAMS) Norbornadiene References Lithography, based on traditional ink-printing techniques, is a process for patterning va...

    MacMillan Imidazolidinone OrganoCatalysts™

    Product Highlights • Superior enantiocontrol in numerous transformations • High activities at low catalyst loadings • Extraordinary functional group tolerance • Asymmetric α-fluorination employed in natural product synthesis MacMillan and co-workers have created chiral imidazolidinone organo-catalys...

    MacMillan Imidazolidinone OrganoCatalysts

    Aldrich ChemFiles 2006, 6.7, 11. Product Highlights • Superior enantiocontrol in numerous transformations • High activities at low catalyst loadings • Extraordinary functional group tolerance MacMillan and co-workers have created chiral imidazolidinone organocatalysts that function as the linchpin i...

    Hydrosilylation Catalyst in Chemical Synthesis

    [Cp*Ru(MeCN)3]PF6: A Highly Efficient Hydrosilylation Catalysts Vinylsilanes are versatile organometallic reagents that participate in a variety of reaction paradigms such as Tamao–Fleming oxidation, olefin metathesis, Pd-catalyzed cross-coupling, protodesilylation, and cycloaddition. Of the availab...

    Click Chemistry, a newer approach to the synthesis of drug-like molecules

    A "Click" Away From Discovery: The traditional process of drug discovery based on natural secondary metabolites has often been slow, costly, and labor-intensive. Even with the advent of combinatorial chemistry and high-throughput screening in the past two decades, the generation of leads is dependen...

    Dendrons and Hyperbranched Polymers: Multifunctional Tools for Materials Chemistry

    Products • Dendron • Dendrimers • Surface Functionalized Nanoparticles • Biodegradable Polymers • Hydrophilic Polymers • Polyphosphoesters Related Articles • Dendritic Polyester Scaffolds for Drug Delivery Applications • Degradex® Microspheres and Nanoparticles for Drug Delivery Research and Formula...

    Functional RAFT Polymers for Biomedical Applications

    M. Shahinur Rahman,* Sebastian Grajales Aldrich Materials Science, Sigma-Aldrich Co. LLC *Email: Shahinur.Rahman@sial.com Reversible addition–fragmentation chain transfer (RAFT) polymerization is rapidly moving to the forefront in construction of drug and gene delivery vehicles. The RAFT technique a...

    Unsaturated Amino Acids

    Recent developments in Chemical Biology research have increased the demand of amino acid building blocks with unsaturated side chains. Alkyne moieties can be used in bioorthogonal synthesis strategies to form hybrid structures, introduce chemical probes into biomolecules, or link large fragments wit...

    Intramolecular Cycloaddition of 1,3-Enynes with Alkenes | ChemFiles Volume 10 Article 4

    Echavarren and co-workers employed a crystalline gold complex containing either the o-biphenyl phosphine ligand JohnPhos, or a bulky aryl ether phosphine under mild conditions to eff ect the [4+2] cycloaddition of 1,3-enynes with olefi ns. A family of biand tricyclic scaff olds were prepared in good...

    Core functionalization of Polyester-16-hydroxyl-1-acetylene bis-MPA dendron

    Theoretical MW: 1797.79 g/mol Average Molecular Formula: C78H124O46 Number of hydroxyl groups: 16 Number of acetylene groups: 1 This monodisperse compound has multiple surface hydroxyl groups and a single alkyne focal point function. The alkyne function is well suited for “Click chemistry” catalytic...

    Chemfiles Volume 6 Article | MacMillan Imidazolidinone OrganoCatalysts™

    Developed by Professor David MacMillan at Caltech, imidazolidinonebased organocatalysts are designed to serve as general catalysts for a myriad of asymmetric transformations. The first highly enantioselective organocatalytic Diels–Alder reaction using a chiral organocatalyst (569763) was reported in...

    Diels–Alder Reaction

    The Diels–Alder reaction is the reaction between a conjugated diene and an alkene (dienophile) to form unsaturated six-membered rings. Since the reaction involves the formation of a cyclic product via a cyclic transition state, it is also referred to as a "cycloaddition". The Diels–Alder reaction is...

    Cycloisomerization of 1,4-, 1,5-,1,6-, and 1,7-Enynes

    Aldrich ChemFiles 2009, 9.5, 4. The enyne cycloisomerization is one of the most important reaction for the synthesis of functionalized cyclic structures.1 The structural complexity resulting from the cyclization of relatively simple acyclic subunits explains the enthusiasm surrounding this method. A...

    Cycloaddition Reagents

    Aldrich ChemFiles 2006, 6.2, 8. 1-(2-Methoxyethoxy)-1-vinycyclopropane Vinylcyclopropanes (VCPs) are excellent scaffolds for construction of seven-membered and bicyclic ring systems. Paul Wender, of Stanford University, has developed a simple but versatile VCP reagent (1-(2-methoxyethoxy)-1-vinycycl...

    Zhang Group - Professor Product Portal Index

    Professor Product Portal Index Professor Liming Zhang The major research thrust in Professor Liming Zhang’s group is homogeneous gold catalysis ranging from discovery of novel reactivities, design of new ligands, development of versatile synthetic methods and application in natural product synthesis...

    Electronics and Self-Assembly with Single Molecules

    • • Download PDF • Nano-Science Center & Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100 Copenhagen, Denmark Thomas Bjørnholm E-mail: tb@nano.ku.dk Single molecule electronics is the endeavour of constructing electronic circuitry with single molecules as the fundamental...

    Asymmetric Cycloaddition

    The asymmetric 1,3-dipolar cycloaddition reaction is of the utmost importance for the enantioselective synthesis of five-membered heterocycles. Cabrera et al. introduced a new family of ligands consisting of a planar chiral P,S-ligand, named Fesulphos, for the 1,3-dipolar cycloaddition of azomethine...

    Chemistry at Surfaces with Self-Assembled Monolayers and SAMDI-ToF Mass Spectrometry

    Prof. Milan Mrksich Department of Chemistry The University of Chicago Chicago, IL mmrksich@uchicago.edu Modern synthetic chemistry permits the construction of elaborate molecular structures and has been vital to the development of pharmaceuticals, catalysts, and functional polymers. Chemists no long...