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    Search term:"cycloadditions"

    73 matches found for cycloadditions

    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...

    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...

    MacMillan Imidazolidinone OrganoCatalysts™ | Product Highlights

    Aldrich ChemFiles 2006, 6.2, 9. 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 chira...

    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...

    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...

    Nathan Luedtke Group – Products available at Aldrich from the Luedtke Laboratory

    Professor Product Portal Index Professor Nathan Luedtke Metabolic incorporation of a bioorthogonal functional group (e.g. alkyne, azide, alkene, etc.) into cellular DNA can be achieved by simply adding a synthetic nucleoside to the nutritional media of cells or whole animals. Intracellular enzymes i...

    (R)-(+)- and (S)-(-)-Stericol: New, Effective Chiral Auxiliaries

    Introduction Introduction of chirality in organic molecules through the use of auxiliaries is a basic strategy in organic chemistry. Chiral benzylic alcohols are of particular interest because they often afford useful levels of stereoselection and are generally easy to cleave. The enantiomers of 1-(...

    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...

    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...

    Neil Garg Group - Professor Product Portal

    Professor Product Portal Index Professor Neil Garg The Garg group develops methods for the synthesis of natural products and pharmaceuticals. One key method pertains to heterocyclic arynes, such as indolynes and pyridynes, which are generated in situ from silyltriflate precursors under mild fluoride...

    Nicewicz Photoredox Catalysts for Anti-Markovnikov Alkene Hydrofunctionalization

    While Markovnikov alkene reactivity is very well developed and utilized commonly in the synthesis of commodity and research chemicals, catalytic access to the anti-Markovnikov-selective adducts is a much less-developed endeavor. In collaboration with Professor David Nicewicz, Sigma-Aldrich is proud ...

    Asymmetric 1,3-dipolar Cycloaddition Using Fesulphos

    Aldrich ChemFiles 2008, 8.6, 14. 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-di...

    "Click" Chemistry in (Bio)Materials Science

    • • Download PDF • 1Organic Chemistry, Institute for Molecules and Materials, Radboud University Nijmegen, The Netherlands 2Encapson B.V, The Netherlands j.vanhest@science.ru.nl Combining biomolecules and synthetic polymers into a new class of versatile biohybrid materials with many (future) fields ...

    Intramolecular Cycloaddition of 1,3-Enynes with Alkenes | Aldrich ChemFiles 2009, 9.5, 5.

    Aldrich ChemFiles 2009, 9.5, 5. In 2008, Echavarren and co-workers in their quest for finding more active gold catalysts for new reactions, reported the synthesis of pycnantuquinones A derivatives, catalyzed by [4+2] cycloaddition of dienynes.1 Usually, [4+2] cycloadditions of enynes with alkenes ta...

    Alkynes

    Aldrich ChemFiles 2006, 6.6, 6. Alkynes have been used for many years in the Sonogashira coupling reaction1 and related Castro-Stephens reaction,2 and have recently gained considerable interest in the Huisgen 1,3- dipolar cycloaddition with organic azides.3 Recently, Walsh demonstrated the use of te...

    Bioconjugation

    Bioconjugation involves ligating molecules together in which at least one of the reactants is a biomolecule, often an antibody, protein, or oligonucleotide. Applications include attaching fluorescent probes to antibodies for flow cytometry and microscopy imaging, attaching antibodies to beads for im...

    Yoon Group – Professor Product Portal

    Professor Product Portal Index Professor Tehshik Yoon One major theme of research in the Yoon lab is the development of unique chemical transformations enabled by visible light photochemistry. A variety of transition metal photocatalysts responsive to visible light are known, and the Yoon lab has sh...

    Copper-Free Click Chemistry

    Click chemistry involves the rapid generation of compounds by joining small units together via heteroatom links (C-X-C). The main objective of click chemistry is to develop a set of powerful, selective, and modular “blocks” that are useful for small- and large-scale applications. Reaction processes ...

    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...

    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...

    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...

    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...

    Injectable Hydrogels for Cell Delivery and Tissue Regeneration

    Prathamesh M. Kharkar,1 April M. Kloxin1,2* 1Materials Science and Engineering and 2Chemical and Biomolecular Engineering University of Delaware, Newark, DE 19716 USA *Email: akloxin@udel.edu The use of hydrogel-based biomaterials for the delivery and recruitment of cells to promote tissue regenerat...

    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...

    Protein and Peptide Polymer Conjugates

    1Department of Chemistry, The University of Warwick, Coventry CV4 7AL, U.K. 2Warwick Medical School, The University of Warwick, Coventry CV4 7AL, U.K. 3Faculty of Pharmacy and Pharmaceutical Sciences, Monash University, VIC 3052, Australia *Email: s.perrier@warwick.ac.uk The modification of biomacro...

    Chiral Phospholane Ligands

    Aldrich ChemFiles 2007, 7.3, 15. Chiral phospholane ligands have been used extensively in transition metal-catalyzed asymmetric hydrogenations and other novel asymmetric reactions including [4+1] cycloadditions, imine alkylations, and allylborations. Available in either enantiomeric form with Me, Et...

    Intermolecular [4+3]-Annulation

    Aldrich ChemFiles 2009, 9.5, 4. In 2008, Toste and coworkers developed a new method to synthesize azepines using a Au(III) catalyst.1 Following the work done by the group with sulfoxides showing that the allylgold intermediate can be induced to react as a nucleophile, Shapiro and Toste reacted vario...

    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...

    Click Chemistry

    Perhaps no reaction in the click family has received more attention than the Cu(I)-catalyzed Huisgen 1,3-dipolar cycloaddition of terminal alkynes with organoazides to yield 1,4-disubstituted 1,2,3-triazoles (Scheme 1).1 True to a “good” click reaction, the reaction is reliable and high yielding, ea...

    Janis Louie Group – Professor Product Portal

    Professor Product Portal Index Professor Janis Louie Professor Louie's research focuses on the discovery and mechanistic understanding of new reactions catalyzed by transition metal complexes. She has developed a highly active Ni(0) catalyst that effectively mediates a variety of cycloaddition and i...