4-Chlorophthalic anhydride

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4-Chlorophthalic anhydride
File:4-Chlorophthalic anhydride.png
style="background: #F8EABA; text-align: center;" colspan="2" | Identifiers
CAS number 118-45-6
style="background: #F8EABA; text-align: center;" colspan="2" | Properties
Molecular formula C8H3ClO3
Molar mass 182.56 g mol−1
Melting point

~99 °C

Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

4-Chlorophthalic anhydride is a monochlorinated aromatic anhydride. It is an isomer of 3-chlorophthalic anhydride and a derivative of phthalic anhydride.


It has a melting point of around 99 °C. Like most acid anhydrides, it can hydrolyze in the presence of water.


It can be produced by chlorination of phthalic anhydride.


It may be used to produce herbicides and pesticides, intermediates for active pharmaceutical ingredients and can be used as a monomer for the production of polyimides.