OO.FC(F)(F)C(OC(=O)C(F)(F)F)=[O:6].P([O-])([O-])(O)=O.[Na+].[Na+].[Cl:23][C:24]([Cl:35])([Cl:34])[CH2:25][O:26][C:27]([N:29]1[CH2:33][CH:32]=[CH:31][CH2:30]1)=[O:28]>C(Cl)Cl.O>[O:6]1[CH:31]2[CH:32]1[CH2:33][N:29]([C:27]([O:26][CH2:25][C:24]([Cl:23])([Cl:34])[Cl:35])=[O:28])[CH2:30]2
12 ml of 90% strength hydrogen peroxide (0.48 mol) are dissolved in 40 ml of methylene chloride and the solution is treated at 0° with 63.5 ml (0.45 mol) of trifluoroacetic anhydride. After stirring for 15 minutes at 0°, the solution is added dropwise to a suspension, which is kept at 0°, of 196 g of anhydrous disodium hydrogen phosphate in 800 ml of methylene chloride, in which 41.8 g (0.17 mol) of N-(β,β,β-trichloroethoxycarbonyl)-3-pyrroline has been dissolved. Subsequently, the reaction mixture is stirred for 2 hours at room temperature and then stirred into 900 ml of water and the resulting mixture is stirred for a further one hour. The organic phase is separated off and the aqueous phase is extracted by shaking with 3 times 200 ml of methylene chloride; the combined organic phases are washed successively with aqueous sodium chloride solution, aqueous iron-II sulphate solution and then with water, dried over sodium sulphate and evaporated under a water pump vacuum, whereupon 3,4-epoxy-1-(β,β,β-trichloroethoxycarbonyl)-pyrrolidine is obtained in the form of white crystals with a melting point of 52°-55°.
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