[CH2:1]([C:6]1[O:10][CH:9]=[N:8][C:7]=1[C:11]([O:13]C)=[O:12])[CH2:2][CH2:3][CH2:4][CH3:5].[OH-].[K+].CO>O>[CH2:1]([C:6]1[O:10][CH:9]=[N:8][C:7]=1[C:11]([OH:13])=[O:12])[CH2:2][CH2:3][CH2:4][CH3:5]40 g of 5-n-pentyl-4-methoxycarbonyloxazole, 27 g of potassium hydroxide, 1000 ml of methanol and 50 ml of water are treated in the same manner as described in Preparation 1-(2). 29.7 g of 5-n-pentyl-4-oxazolecarboxylic acid are thereby obtained. Yield: 80%.
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