Add time:08/28/2019 Source:sciencedirect.com
Fluorination of Tetrachlorophthalic anhydride (cas 117-08-8) 1 or tetrachlorophthalic acid hemihydrate 4 with an excess of sulphur tetrafluoride provides an efficient one-step synthesis of 4,5,6,7-tetrachloro-1,1,3,3-tetrafluoro-1,3-dihydroisobenzofuran 2. 3,4,5,6-Tetrachloro-2-(trifluoromethyl)benzoyl fluoride 3 is formed as a side product. A method for the quantitative removal of fluoride 3 and its isolation as 3,4,5,6-tetrachloro-2-(trifluoromethyl)benzoic acid 6 has been developed. The reduced SF4 to 1 ratio gives a mixture of 2 and 4,5,6,7-tetrachloro-3,3-difluoro-3-hydroisobenzofuranone 5.
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