C([O:8][C:9]1[CH:14]=[C:13]([CH2:15][CH:16]([C:18]2[CH:23]=[CH:22][C:21]([O:24]CC3C=CC=CC=3)=[C:20]([O:32]CC3C=CC=CC=3)[CH:19]=2)[OH:17])[O:12][C:11](=[O:40])[CH:10]=1)C1C=CC=CC=1.[H][H]>C(O)C.[Ni]>[OH:8][C:9]1[CH:14]=[C:13]([CH2:15][CH:16]([C:18]2[CH:23]=[CH:22][C:21]([OH:24])=[C:20]([OH:32])[CH:19]=2)[OH:17])[O:12][C:11](=[O:40])[CH:10]=135.6 g (66.6 mmol) 4-benzyloxy-6-[2-[3,4-dibenzyloxyphenyl)-2-hydroxy-ethyl)]-2H-pyran-2-one (VI) was hydrogenated for 6 hours at room temperature under a hydrogen pressure of 44 mbar in 1200 ml ethanol using 10 g W2 Raney nickel. After taking up 4.4 l hydrogen the catalyst was removed by suction filtration and it was rewashed several times with tetrahydrofuran. The evaporated filtrates yielded 12.2 g (70%) VII after triturating with ether, melting point 153° C. (decomp.).
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