[C:1]([O:5][OH:6])([CH3:4])([CH3:3])[CH3:2].[OH-].[Na+].[C:9]1([CH3:24])[CH:14]=[CH:13][C:12]([O:15][C:16]([CH2:18][CH2:19][CH2:20][C:21](Cl)=[O:22])=[O:17])=[CH:11][CH:10]=1.O=O>C(OCC)C>[C:21]([O:6][O:5][C:1]([CH3:4])([CH3:3])[CH3:2])(=[O:22])[CH2:20][CH2:19][CH2:18][C:16]([O:15][C:12]1[CH:11]=[CH:10][C:9]([CH3:24])=[CH:14][CH:13]=1)=[O:17]To a vigorously stirred solution of 4.9 g. (0.045 mole) of 82.0% t-butyl hydroperoxide and 18.0 g. (0.045 mole) of aqueous 10% sodium hydroxide at 10°-14° C. was slowly added 8.2 g. (0.034 mole) of 4-(p-tolyloxycarbonyl)butyryl chloride (prepared from p-tolyl 4-carboxybutyrate and thionyl chloride) in 25 ml. of diethyl ether. The reaction mixture was then stirred for 3.5 hours at 8°-10° C. After a work-up similar to that in Example I 8.2 g. (theory, 10.0 g.) of white solid, m.p. 50°-55° C., was obtained. The assay according to "active oxygen" content was 93.6% and the corrected yield was 76.7%.
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