Common Name Phthalide 

Other Names 2-Benzofuranone | o-Hydroxymethylbenzoic acid lactone | 2-Benzofuranone
English Name Phthalide
CAS Number 87-41-2
EINECS 201-744-0
Molecular Formula C8H6O2
Molecular Weight 134.132
Density 1.3±0.1 g/cm3
Boiling Point 290.0±0.0 °C
Melting Point 71-74 °C
Flash Point 124.8±22.2 °C
Appearance White to off-white crystalline powder
Solubility Soluble in ethanol and hot water, very slightly soluble in water.
Uses
1. Used as an intermediate in organic synthesis for the production of drugs such as Doxepin and dyes like Vat Brown BR.
2. Phthalide is an intermediate for the fungicide Kresoxim-methyl.
3. Used as an intermediate in fine chemicals. It is employed in the production of dye intermediates such as 1,4-dichloroanthraquinone and 1-chloroanthraquinone, the anticoagulant Phenindione, the fungicide Fthalide, and the anti-anxiety drug Doxepin.