In organic chemistry, a cycloaddition is a chemical reaction in which "two or more unsaturated molecules (or parts of the same molecule) combine with...

cycloaddition is a chemical reaction between a 1,3-dipole and a dipolarophile to form a five-membered ring. The earliest 1,3-dipolar cycloadditions were...

The azide-alkyne Huisgen cycloaddition is a 1,3-dipolar cycloaddition between an azide and a terminal or internal alkyne to give a 1,2,3-triazole. Rolf...

fulfill the requirements of bioorthogonality, including the 1,3-dipolar cycloaddition between azides and cyclooctynes (also termed copper-free click chemistry)...

mechanism. More specifically, it is classified as a thermally allowed [4+2] cycloaddition with Woodward–Hoffmann symbol [π4s + π2s]. It was first described by...

better than others:[clarification needed] [3+2] cycloadditions, such as the Huisgen 1,3-dipolar cycloaddition, in particular the Cu(I)-catalyzed stepwise...

to cycloaddition products in high enantiomeric excess. In rarer cases, ketenes may undergo [3+2], and [4+2] cycloadditions. [3+2] Cycloadditions may...

of an iminium ion next to a carbanion. They are used in 1,3-dipolar cycloaddition reactions to form five-membered heterocycles, including pyrrolidines...

cycloaddition reaction is the combination of a nitrone with an alkene or alkyne to generate an isoxazoline or isoxazolidine via a (3+2) cycloaddition...

formidable (up to ca. 5 eV or 480 kJ/mol in the case of a forbidden [2+2] cycloaddition), the prohibition is not absolute, and symmetry-forbidden reactions...

In organic chemistry, enone–alkene cycloadditions are a version of the [2+2] cycloaddition. This reaction involves an enone and alkene as substrates....

(FMO) or the Dewar-Zimmermann model. Cycloadditions that are not thermally allowed, such as the [2+2] cycloaddition, can be enabled by photochemical activation...

specialized cycloadditions include multicomponent reactions such as alkyne trimerisation to give aromatic compounds and the [2+2+1]-cycloaddition of an alkyne...

cheletropic reactions are often classed as group transfer reactions and cycloadditions/cycloeliminations, respectively, while dyotropic reactions and group...

An alkyne trimerisation is a [2+2+2] cycloaddition reaction in which three alkyne units (C≡C) react to form a benzene ring. The reaction requires a metal...

hydrolysis with Mercury(II) chloride in water. Thiazoles can react in cycloadditions, but in general at high temperatures due to favorable aromatic stabilization...

The Bradsher cycloaddition reaction, also known as the Bradsher cyclization reaction is a form of the Diels–Alder reaction which involves the [4+2] addition...

intermediates in chemical synthesis. A nitrone is a 1,3-dipole used in cycloadditions, and a carbonyl mimic. Nitrones, as a tetrasubstituted double bond,...

achievement was the development of the 1,3-dipolar cycloaddition reaction, also called the Huisgen cycloaddition. Huisgen was born in Gerolstein in Rhineland-Palatinate...

Curtius rearrangement. Rolf Huisgen described the eponymous 1,3-dipolar cycloaddition. The interest in azides among organic chemists has been relatively modest...

and amines, to generate carboxylic acid derivatives or undergo [2+2] cycloaddition reactions to form four-membered rings. The mechanism of the Wolff rearrangement...

14. Gold-catalyzed formal intramolecular [4+2] cycloaddition of 1,6-enynes This formal cycloaddition was proposed to proceed via the cascade process...

reactions, such as [2+1] and [2+2] cycloaddition reaction with different kinds of unsaturated molecules, [4+1] cycloaddition with 1,3-dimethyl-1,3-butadiene...

is a bioorthogonal reaction as a variant of an azide-alkyne Huisgen cycloaddition. By eliminating cytotoxic copper catalysts, the reaction proceeds without...

The Boger pyridine synthesis is a cycloaddition approach to the formation of pyridines named after its inventor Dale L. Boger, who first reported it in...

there are more. Some ylides are 1,3-dipoles and interact in 1,3-dipolar cycloadditions. For instance an azomethine ylide is a dipole in the Prato reaction...

number of these systems is odd then the reaction is thermally allowed. A cycloaddition is a reaction that simultaneously forms at least two new bonds, and...

molecule. An important example of cycloaddition reaction is the Diels–Alder reaction (the so-called [4+2] cycloaddition) between a conjugated diene and...

pressure. Alkylidene ketenes can readily dimerize and participate in cycloaddition reactions. Often orange or red in color, these dimers can be generated...

Vinylcyclopropane (5+2) cycloaddition is a type of cycloaddition between a vinylcyclopropane (VCP) and an olefin or alkyne to form a seven-membered ring...