Supply high quality 99.5%min Phthalic anhydride . CAS NO.85-44-9

phthalic anhydride cas no. 85-44-9

phthalic anhydride (pa) / cas no. 85-44-9 / phthalic anhydride 99.5% / c8h4o3

1 .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 2002, approximately 4.6 billion kilograms were produced

2. applications in industry and organic synthesis

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 180 °c.

3. 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 5-membered ring.

organic synthesis

4 .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:

c6h4(co)2o + h2o2 → c6h4(co3h)co2h

5. precursor to dyestuffs

6. application:

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.

7.package and storage

packed in 25kg knitted plastic bag with inner plastic bag and no danger; keep in cool and dry place.