6 4 Cycloaddition - définition. Qu'est-ce que 6 4 Cycloaddition
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Qu'est-ce (qui) est 6 4 Cycloaddition - définition

ORGANIC CHEMICAL REACTION
Retro-cycloaddition; Cycloaddition reaction; Cycloadditions; 4+3 cycloaddition
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  • Diels-Alder reaction
  • Nitrone olefin cycloaddition

6+4 Cycloaddition         
CHEMICAL REACTION
User:Mevans86/6+4 cycloaddition; User:OrganicReactions/6+4 cycloaddition; 6+4 cycloaddition
[6+4] Cycloaddition is a type of cycloaddition between a six-atom pi system and a four-atom pi system, leading to a ten-membered ring. Because this is a higher-order cycloaddition, issues of periselectivity arise in addition to the usual concerns about regio- and stereoselectivity.
Cycloaddition         
In organic chemistry, a cycloaddition is a chemical reaction in which "two or more unsaturated molecules (or parts of the same molecule) combine with the formation of a cyclic adduct in which there is a net reduction of the bond multiplicity". The resulting reaction is a cyclization reaction.
Matthew 4:6         
VERSE OF THE BIBLE
Mt. 4:6
Matthew 4:6 is the sixth verse of the fourth chapter of the Gospel of Matthew in the New Testament. Jesus has just rebuffed "the tempter's" first temptation; in this verse, the devil presents Jesus with a second temptation while they are standing on the pinnacle of the temple in the "holy city" (Jerusalem).

Wikipédia

Cycloaddition

In organic chemistry, a cycloaddition is a chemical reaction in which "two or more unsaturated molecules (or parts of the same molecule) combine with the formation of a cyclic adduct in which there is a net reduction of the bond multiplicity". The resulting reaction is a cyclization reaction. Many but not all cycloadditions are concerted and thus pericyclic. Nonconcerted cycloadditions are not pericyclic. As a class of addition reaction, cycloadditions permit carbon–carbon bond formation without the use of a nucleophile or electrophile.

Cycloadditions can be described using two systems of notation. An older but still common notation is based on the size of linear arrangements of atoms in the reactants. It uses parentheses: (i + j + …) where the variables are the numbers of linear atoms in each reactant. The product is a cycle of size (i + j + …). In this system, the standard Diels-Alder reaction is a (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.

A more recent, IUPAC-preferred notation, first introduced by Woodward and Hoffmann, uses square brackets to indicate the number of electrons, rather than carbon atoms, involved in the formation of the product. In the [i + j + ...] notation, the standard Diels-Alder reaction is a [4 + 2]-cycloaddition, while the 1,3-dipolar cycloaddition is also a [4 + 2]-cycloaddition.