[Na+].[Cl-].[O:3]([CH2:10][C:11]([OH:13])=[O:12])[C:4]1[CH:9]=[CH:8][CH:7]=[CH:6][CH:5]=1.[OH-].[Na+].Cl[C:17]([O:19][CH:20]([CH2:22][CH3:23])[CH3:21])=[O:18]>C(OCC)C>[C:17](=[O:18])([O:19][CH:20]([CH3:21])[CH2:22][CH3:23])[O:12][C:11](=[O:13])[CH2:10][O:3][C:4]1[CH:9]=[CH:8][CH:7]=[CH:6][CH:5]=1To a well-stirred reaction vessel equipped with a thermometer and a pH electrode were added 100 ml of diethyl ether, 40 ml of a 25 wt % aqueous NaCl solution, and 0.4 g of Arquad CB50. After cooling the reaction mixture to 5-10° C., 0.066 mole of phenoxy acetic acid was added. The pH was adjusted to a value between 6 and 7 using a 25 wt % aqueous NaOH solution. Then, 0.066 mole of sec-butyl chloroformate was dosed within 5 min at 5-10° C. During this time and a post-reaction time of 40 min at 5-10° C. the pH was kept at 6-7. The reaction mixture was allowed to separate. After removal of the diethyl ether, 15 g of phenoxyacetyl 1-methyl-1-propyl carbonate having a content of 90% were obtained in a yield of 81%.
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