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.

4-Chlorophthalic anhydride

Names
Preferred IUPAC name 5-Chloro-2-benzofuran-1,3-dione
Identifiers
CAS Number	118-45-6 Y
3D model (JSmol)	Interactive image
ChemSpider	60395 Y
ECHA InfoCard	100.003.866
PubChem CID	67044
UNII	BPI93D0O61 Y
CompTox Dashboard (EPA)	DTXSID30151993
InChI InChI=1S/C8H3ClO3/c9-4-1-2-5-6(3-4)8(11)12-7(5)10/h1-3H Y Key: BTTRMCQEPDPCPA-UHFFFAOYSA-N Y InChI=1/C8H3ClO3/c9-4-1-2-5-6(3-4)8(11)12-7(5)10/h1-3H Key: BTTRMCQEPDPCPA-UHFFFAOYAB
SMILES Clc1ccc2C(=O)OC(=O)c2c1
Properties
Chemical formula	C8H3ClO3
Molar mass	182.56 g·mol−1
Melting point	~99 °C
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). N verify (what is YN ?) Infobox references

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.

References

• Chlorination of phthalic anhydride http://www.freepatentsonline.com/4297283.html