- all
cycloadditions are
concerted and thus pericyclic.
Nonconcerted cycloadditions are not pericyclic. As a
class of
addition reaction,
cycloadditions permit...
-
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...
-
better than others:[clarification needed] [3+2]
cycloadditions, such as the ****sgen 1,3-dipolar
cycloaddition, in
particular the Cu(I)-catalyzed stepwise...
- side reactions. Some
success has been
found with non-metal-catalyzed
cycloadditions, such as the
reactions using dipolarophiles that are electron-poor olefins...
-
intermediates in
chemical synthesis. A
nitrone is a 1,3-dipole used in
cycloadditions, and a
carbonyl mimic. Nitrones, as a
tetrasubstituted double bond,...
- act as 4π
partners in [4+2]
cycloadditions as well. The
unique transition state geometry of [2+2]
ketene cycloadditions has
important stereochemical...
- (FMO) or the Dewar-Zimmermann model.
Cycloadditions that are not
thermally allowed, such as the [2+2]
cycloaddition, can be
enabled by
photochemical activation...
- the
cycloaddition must be intramolecular.
Stereoselectivity and site
selectivity may also be
higher in
intramolecular variants of
cycloadditions starting...
-
iridium and
other metals.
Vinylcyclopropanes can
undergo formal [5+2]
cycloadditions with
highly activated dienophiles such as
tetracyanoethylene (TCNE)...
- PMID 21970470. ****sgen, Rolf. (1976). "1,3-Dipolar
cycloadditions. 76.
Concerted nature of 1,3-dipolar
cycloadditions and the
question of
diradical intermediates"...
