[CH2:1]([O:8][CH2:9][C:10]1([CH2:18][CH3:19])[CH2:15][O:14]C(C)(C)[O:12][CH2:11]1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.O>CO>[CH2:1]([O:8][CH2:9][C:10]([CH2:15][OH:14])([CH2:18][CH3:19])[CH2:11][OH:12])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=15-Benzyloxymethyl-2,2-dimethyl-5-ethyl-1,3-dioxane (15.0 g.) and Dowex 50×8-200 ion exchange resin (H+ form) (2.0 g.) in methanol (250ml.) containing water (50 ml.) was refluxed, with stirring, for three hours. The mixture was filtered and the filtrate was evaporated in vacuo. 2-Benzyloxymethyl-2-hydroxymethyl-butan-1-ol was obtained as a yellow oil (9.7 g.).
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