Hydrochloric Acid → 3-(alpha,alpha,alpha,alpha',alpha',alpha'-Hexafluoro-3,5-Xylyl)-4,5-Isothiazoledicarboxylic Acid

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Reaction Steps

A mixture of 14.7 g (0.0356 mol) of dimethyl 3-(α,α,α,α',α',α'-hexafluoro-3,5-xylyl)-4,5-isothiazoledicarboxylate, 7.2 g (0.18 mol) of NaOH, and 45 ml of water was held at reflux for 2 hours, was cooled, extracted twice with ether, and acidified with 30 ml (0.36 mol) of concentrated HCl. The resultant mixture was extracted three times with ether; these ether extracts were combined, dried (CaSO4), and concentrated under vacuum to 12.8 g (93.4%) of white solid, m.p. 193°-193.5° with decomposition.

Provenance & Evidence