Information om | Engelska ordet CYCLOADDITIONS

Exempel på hur man kan använda CYCLOADDITIONS i en mening

• As a class of addition reaction, cycloadditions permit carbon–carbon bond formation without the use of a nucleophile or electrophile.
• Enone–alkene cycloadditions - photochemical reaction of an enone with an alkene to give a cyclobutene ring unit.
• When used as a ligand, complexed to copper(I), it allows for quantitative, regioselective formal Huisgen 1,3-dipolar cycloadditions between alkynes and azides, in a variety of aqueous and organic solvents.
• Copper catalyzed cycloadditions favor 1,4-disubstituted triazoles, Ruthenium catalyzed cycloaddition favor 1,5-disubstituted triazoles.
• The components of all pericyclic reactions, including sigmatropic reactions and cycloadditions, and electrocyclizations, can be classified as either suprafacial or antarafacial, and this determines the stereochemistry.
• The synthesis involves introducing annulation to appropriate amino acid residues to rigidify glycopeptides, followed by Diels-Alder cycloadditions to fuse cyclic α- and β-amino acids to the sugar moiety.
• Also known are protocols for cycloadditions such as Diels-Alder reactions, 1,3-dipolar cycloadditions of azomethine ylides and azide–alkyne cycloaddition reactions.
• Ketene cycloadditions are the reactions of the pi system of ketenes with unsaturated compounds to provide four-membered or larger rings.
• He is particularly interested in reactions of lithiated alkoxyallenes, the use of samarium diiodide in synthesis and cycloadditions of nitroso alkenes.
• Diethyl oxomalonate reacts because of its highly polarized keto group as electrophile in addition reactions and is a highly active reactant in pericyclic reactions such as the Diels-Alder reactions, cycloadditions or ene reactions.
• He was a prolific researcher in the development of new synthetic methods based on transition-metal catalyzed reactions and investigations into their mechanisms, which includes hydrosilylation, silylformylation, silylcarbocyclizations (SiCaCs, SiCaB, SiCaT), higher order (carbonylative) cycloadditions, hydroformylation, hydrocarbonylations, amidocarbonylations, cyclohydrocarbonylations, and enantioselective processes such as hydrosilylation, hydrogenation, hydroformylation, Michael addition, allylic alkylation/amination/etherification, etc.
• In contrast, bioorthogonal 1,3-dipolar cycloadditions (see also copper-free click chemistry and Huisgen cycloaddition) generally require prior introduction of azide or cycloalkyne functionalities to biomolecules.
• These adducts are then able to do many reactions, such as carboxylative cyclizations of propargyl alcohols and cycloadditions with aziridines to yield oxazolidinones.

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