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Phthalic
Anhydride (Other Names: Phthlandion
Phthalicacidanhydride)Â
CAS
No.: ******9Â
MF:
C8H4O3Â
Purity:
*9.8%minÂ
Specification:Â
Phthalic anhydride is the
organic compound with the formula C8H4O3. This anhydride of
phthalic acid, a colourless solid, is an important industrial
chemical, especially for the large-scale production of plasticizers
for plastics. In ***2, approximately 4.6 billion kilograms were
producedÂ
Uses: In industry and
organic synthesisÂ
Phthalic anhydride is a
versatile intermediate in organic chemistry, in part because it is
bifunctional and cheaply available. It undergoes hydrolysis and
alcoholysis. Hydrolysis by hot water forms ortho-phthalic acid.
This process is reversible: Phthalic anhydride re-forms upon
heating the acid above **0 ° C.Â
Hydrolysis of anhydrides is
not typically a reversible process. However, phthalic acid is
easily dehydrated to form phthalic anhydride due to the creation of
a thermodynamically favorable *-membered ring.Â
Organic
synthesisÂ
Phthalic anhydride is a
precursor to a variety of reagents useful in organic synthesis.
Important derivatives include phthalimide and its many derivatives.
Chiral alcohols form half-esters (see above), and these derivatives
are often resolvable because they form diastereomeric salts with
chiral amines such as brucine. A related ring-opening reaction
involves peroxides to give the useful peroxy
acid:Â
Precursor to
dyestuffsÂ
Phthalic anhydride is widely
used in industry for the production of certain dyes. A well-known
application of this reactivity is the preparation of the
anthroquinone dye quinizarin by reaction with PARA-chlorophenol
followed by hydrolysis of the chloride.Â
Packaging: Inside plastic
film, outside polywoven bag
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