4-Chlorophthalic anhydride
# 4-Chlorophthalic anhydride

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

## Properties

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

## Production

It can be produced by chlorination of phthalic anhydride.

## Applications

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.

