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25.6 g (93.5 mmol) 3-phenylthio-phtalic acid and 26.4 mL (281 mmol) acetic anhydride were heated to reflux for 6 hours. The reaction mixture was allowed to cool down to room temperature. Upon standing over night, 3-phenylthio-phtalic anhydride precipitated from the medium. A first crop of 16.8 g of 3-phenylthio-phtalic anhydride was isolated by filtration and dried. The filtrate was evaporated to half of its volume and a second crop of 4.1 g of 3-phenylthio-phtalic anhydride was isolated. 20.9 g (87%) of 3-phenylthio-phtalic anhydride was isolated (m.p. 148-50° C.)

1. temperatureto reflux for 6 hours
2. waitUpon standing over night
3. custom3-phenylthio-phtalic anhydride precipitated from the medium