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organic chemistry,
acylium ions are
cations with the
formula RCO+,
where R =
alkyl or aryl. They are a kind of carbocation. In
acylium ions, the C-C-O linkage...
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chloride (C6H5COCl).
These compounds,
which are
treated as
sources of
acylium cations, are good
reagents for
attaching acyl
groups to
various substrates...
- or ≡O+, with one lone pair remaining.: 343, 410 In
carbon monoxide and
acylium ions,
oxygen forms a
triple bond to carbon. A
carbon atom
forms one single...
-
crystallography are
consistent with a
cyclohexadienyl cation structure. An
acylium ion is a
cation with the
formula RCO+. The
structure is
described as R−C≡O+...
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acylations do not occur. Also,
there are no
carbocation rearrangements, as the
acylium ion is
stabilized by a
resonance structure in
which the
positive charge...
-
Among the
simplest examples are the
methenium CH+ 3,
methanium CH+ 5,
acylium ions RCO+, and
vinyl C 2H+ 3 cations.
Until the
early 1970s, carbocations...
-
Fischer esterification. An alternative,
involving the
formation of an
acylium ion,
becomes more
important when the
reaction takes place in concentrated...
- acids,
alkenes react with
carboxylic acids.
Hydrolysis of this
species (an
acylium ion)
gives the
carboxylic acid, a net
process known as the Koch–Haaf reaction...
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Benzene is
sufficiently nucleophilic that it
undergoes substitution by
acylium ions and
alkyl carbocations to give
substituted derivatives. The most widely...
-
chloride group rearranges to the
phenolic oxygen atom. This
generates a free
acylium carbocation which reacts in a
classical electrophilic aromatic substitution...
