[CH2:1]([O:3][C:4]([C:6]1(C(OCC)=O)[CH:8]([CH:9]=[C:10]([Cl:12])[Cl:11])[C:7]1([CH3:14])[CH3:13])=[O:5])[CH3:2].O=P1(C)CCC=C1.[Cl-].[Na+]>O>[CH2:1]([O:3][C:4]([CH:6]1[CH:8]([CH:9]=[C:10]([Cl:11])[Cl:12])[C:7]1([CH3:13])[CH3:14])=[O:5])[CH3:2]
30 g (0.1 mol) of 2,2-dimethyl-3-(2',2'-dichlorovinyl)-cyclopropane-1,1-dicarboxylic acid diethyl ester, 50 ml of 1-oxo-1-methyl-phospholine, 6 g of sodium chloride and 4 ml of water were heated to 175° C. for 9 hours. The mixture was then cooled, poured into 150 ml of water and extracted with petroleum ether. After drying with MgSO4, the mixture was fractionally distilled. 21.3 g (=90% of theory) of 2,2-dimethyl-3-(2',2'-dichlorovinyl)-cyclopropane-1-carboxylic acid ethyl ester of boiling point 65°-75° C./0.1 mm Hg were obtained. 49.7 g of 1-oxo-1-methyl-phospholine of boiling point 75°-77° C./0.15 mm Hg were recovered by fractional distillation of the aqueous phase.
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