[K+].[K+].S([O-])([O-])(=O)=O.O[C:9]1[C:19]([O:20][C:21]2[CH:26]=[CH:25][CH:24]=[CH:23][CH:22]=2)=[CH:18][CH:17]=[CH:16][C:10]=1[CH:11]([CH3:15])[C:12]([OH:14])=[O:13].[OH-].[K+]>[Ni].O>[O:20]([C:19]1[CH:9]=[C:10]([CH:16]=[CH:17][CH:18]=1)[CH:11]([CH3:15])[C:12]([OH:14])=[O:13])[C:21]1[CH:22]=[CH:23][CH:24]=[CH:25][CH:26]=1To a solution of 4.2 g. of 2-hydroxy-3-phenoxy-hydratropic acid sulphate dipotassium salt in 50 ml. of water 2 g. of potassium hydroxide and 2 g. of a Raney nickel catalyst prepared freshly according to Urushibara, and the reaction mixture is stirred at 60° C. for 10 to 15 minutes. The catalyst is filtered off and the filtrate is acidified with a 20% aqueous hydrochloric acid solution. The separated solution is extracted with chloroform and the chloroform solution is dried over sodium sulphate and evaporated. 2.35 g. (97%) of 3-phenoxy-hydratropic acid are obtained. Melting point of the corresponding cyclohexylamine salt: 151° C. to 153° C.
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