Potassium Hydroxide → Fenoprofen

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

To 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 Urashibara, 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.

Herkunft & Nachweise