[C:1]([O:20][CH2:21][CH2:22][CH2:23][CH:24]=[O:25])([C:14]1[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=1)([C:8]1[CH:13]=[CH:12][CH:11]=[CH:10][CH:9]=1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[Mn]([O-])(=O)(=O)=[O:27].[K+].Cl.S(=O)(O)[O-].[Na+]>CC(C)=O.O>[C:1]([O:20][CH2:21][CH2:22][CH2:23][C:24]([OH:27])=[O:25])([C:8]1[CH:13]=[CH:12][CH:11]=[CH:10][CH:9]=1)([C:14]1[CH:15]=[CH:16][CH:17]=[CH:18][CH:19]=1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1
To a stirred mixture of 56.2 g of 4-trityloxy-butanal in 430 ml of acetone and 170 ml of water were added portionwise over 1.5 h 27.0 g of potassium permanganate, the temperature of the mixture being maintained at 20° to 25° C. Stirring was continued for 3 h, and then, the pH of the mixture was set to 5 by addition of 22 ml of 3N hydrochloric acid. Over 30 min, 300 ml of 38% sodium bisulfite solution were added dropwise at a reaction temperature of 20° to 30° C. The pH was lowered to 2 by addition of 80 ml of 3N hydrochloric acid, and subsequently the mixture was extracted with 1 l of ethyl acetate. The organic layer was washed with water, dried over sodium sulfate, and the solvent was evaporated in vacuo. The residue was crystallized from ethyl acetate/hexane to yield 46.0 g of 4-trityloxy-butyric acid as a white solid of m.p. 137°-140° C.
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