- In
organic chemistry,
antarafacial (Woodward-Hoffmann
symbol a) and
suprafacial (s) are two
topological concepts in
organic chemistry describing the relationship...
-
antarafacial or
suprafacial. In the
example of a [1,5]
shift in pentadiene, if
there is a
suprafacial shift,
there is 6 e−
moving suprafacially and none moving...
-
temperatures at or
above 200 ˚C.
These reactions are
predicted to
proceed suprafacially, via a Hückel-topology
transition state.
Photoirradiation would require...
-
known as a component, and each
component is said to be
antarafacial or
suprafacial depending on
whether the
orbital lobes that
interact during the reaction...
-
heptafulvalene and N-phenyltriazolinedione also gave both
suprafacial-antarafacial and
suprafacial-
suprafacial products.
Cycloadditions in
which 4n π electrons...
-
described as
cationic [1,2]-sigmatropic rearrangements,
proceeding suprafacially and with
stereochemical retention. As such, a Wagner–Meerwein shift...
-
widely used in
organic synthesis. It is symmetry-allowed when it is
suprafacial on all components. The
transition state of the
molecule p****es through...
- + π2s] cycloaddition,
indicating that it
proceeds through the
suprafacial/
suprafacial interaction of a 4π
electron system (the
diene structure) with...
- and recombination)
pericyclic reaction. Woodward–Hoffmann
rules show a
suprafacial,
stereospecific reaction pathway. The
kinetics are of the
first order...
- be
envisaged as a
disrotatory electrocyclic reaction,
followed by two
suprafacial 1,5-sigmatropic
hydrogen shifts, as
shown below. An
often studied electrocyclic...
