Illustrated Glossary of Organic Chemistry
Sulfur trioxide:
SO
3
. A gas at room temperature, and a
Lewis acid
that reacts with
water
to produce
sulfuric acid
. Rain dissolves atmospheric sulfur trioxide, forming
acid
rain.
Molecular Structure
of Sulfur Trioxide
Lewis structure
Ball and spoke
Space filling model
Sulfur trioxide can be used for
aromatic
sulfonation
via the
electrophilic aromatic substitution
mechanism
. In this example, reaction of
toluene
with sulfur trioxide in
sulfuric acid
(
fuming sulfuric acid
or
oleum
) affords
p
-toluenesulfonic acid
as the
major product
.
Related terms:
Sulfone
,
sulfoxide
,
sulfonate
,
sulfonic acid
,
sulfonyl chloride
,
thionyl chloride
,
sulfonamide
,
sulfate
,
sulfonium salt
Wikipedia entry
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