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The page "2 2 Cycloaddition" does not exist. You can create a draft and submit it for review or request that a redirect be created, but consider checking the search results below to see whether the topic is already covered.

Cycloaddition
(4 + 2)-cycloaddition, the 1,3-dipolar cycloaddition is a (3 + 2)-cycloaddition and cyclopropanation of a carbene with an alkene a (2 + 1)-cycloaddition....

12 KB (1,317 words) - 23:37, 6 December 2024
Woodward–Hoffmann rules (redirect from 2+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...

93 KB (11,920 words) - 14:03, 12 December 2024
Enone–alkene cycloadditions
In organic chemistry, enone–alkene cycloadditions are a version of the [2+2] cycloaddition. This reaction involves an enone and alkene as substrates....

9 KB (1,024 words) - 13:35, 15 May 2025
Ketene cycloaddition
Ketene cycloadditions are the reactions of the pi system of ketenes with unsaturated compounds to provide four-membered or larger rings. [2+2], [3+2], and...

9 KB (1,180 words) - 00:32, 24 August 2024
Nitrone-olefin (3+2) cycloaddition
nitrone-olefin (3+2) cycloaddition reaction is the combination of a nitrone with an alkene or alkyne to generate an isoxazoline or isoxazolidine via a (3+2) cycloaddition...

7 KB (923 words) - 22:24, 27 September 2024
Vinylcyclopropane (5+2) cycloaddition
Vinylcyclopropane (5+2) cycloaddition is a type of cycloaddition between a vinylcyclopropane (VCP) and an olefin or alkyne to form a seven-membered ring...

15 KB (1,523 words) - 02:17, 15 November 2024
Cycloparaphenylene (section [2+2+2]Cycloaddition of Alkynes)
cycloparaphenylenes developed in the Wegner group is based on rhodium-catalyzed [2+2+2]cycloadditions of substituted alkynes. The method has been further investigated...

24 KB (2,675 words) - 08:36, 11 November 2024
Ketene (section [2+2]-cycloaddition)
with alkenes, carbonyl compounds, carbodiimides and imines in a [2+2] cycloaddition. The example shows the synthesis of a β-lactam by the reaction of...

12 KB (1,368 words) - 00:13, 3 May 2025
Intramolecular reaction (redirect from Tethered intramolecular (2+2) reactions)
which are difficult to construct otherwise. Another example is the 2+2 cycloaddition of norbornadiene to give quadricyclane. Many tools and concepts have...

11 KB (1,212 words) - 22:17, 3 December 2023
Metal-centered cycloaddition reactions
A metal-centered cycloaddition is a subtype of the more general class of cycloaddition reactions. In such reactions "two or more unsaturated molecules...

10 KB (1,034 words) - 02:09, 2 August 2024
Photoredox catalysis (section Cycloadditions)
(FMO) or the Dewar-Zimmermann model. Cycloadditions that are not thermally allowed, such as the [2+2] cycloaddition, can be enabled by photochemical activation...

50 KB (6,257 words) - 19:09, 31 March 2025
Azide-alkyne Huisgen cycloaddition
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...

21 KB (2,639 words) - 20:31, 22 July 2024
Digermyne (section [2+1] and [2+2] Cycloaddition)
of 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...

20 KB (2,507 words) - 05:51, 28 November 2024
DeMayo reaction
of 1,3-diketone synthesis to 1,5-diketones. The first part is a [2+2] cycloaddition. The ensuing retro-aldol cleavage is favored by the relative instability...

1 KB (156 words) - 22:27, 27 September 2024
Alkyne trimerisation (category Cycloadditions)
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...

18 KB (1,930 words) - 14:01, 11 February 2025
Phosphetane (section [2+2] cycloaddition)
final method that has been observed to produce phosphetanes is the [2+2] cycloaddition of phosphaalkenes and olefins. This method is not often discussed...

50 KB (5,139 words) - 15:41, 22 May 2025
Sulfinylamine
N-sulfinylaniline. Sulfinyl amines are dienophile. They undergo [2+2] cycloaddition to ketenes. According to X-ray crystallography, sulfinylamines have...

5 KB (444 words) - 15:22, 13 December 2024
Thiazole
in a formal [2+2]cycloaddition to a cyclobutene, then to a 1,3-thiazepine in a 4-electron electrocyclic ring opening and then to a 7-thia-2-azanorcaradiene...

12 KB (1,151 words) - 18:44, 12 March 2025
Sharpless asymmetric dihydroxylation (section [2+2] vs [3+2] debate)
with the formation of the osmium tetroxide – ligand complex (2). A [3+2]-cycloaddition with the alkene (3) gives the cyclic intermediate 4. Basic hydrolysis...

20 KB (2,189 words) - 15:19, 2 December 2024
Wolff rearrangement (section Cycloaddition reactions)
and amines, to generate carboxylic acid derivatives or undergo [2+2] cycloaddition reactions to form four-membered rings. The mechanism of the Wolff...

36 KB (4,578 words) - 15:22, 15 August 2024

Quotes from Wikiquote
Nucleophilic substitution
alkyl azides are readily reduced to primary amines, while 1,3 - dipolar cycloadditions of azide derivatives with dipolarophiles such as alkenes, alkynes, and
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Textbooks from Wikibooks
Structural Biochemistry/Organic Chemistry
alkene added is called dienophile. The reaction is also called a [4+2]cycloaddition. This type of reaction can still be carried out in the absence of carbon
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