O.O.[Cr](O[Cr]([O-])(=O)=O)([O-])(=O)=O.[Na+].[Na+].S(=O)(=O)(O)O.O.[OH:20][CH:21]1[CH2:26][CH2:25][CH:24]([CH:27]([C:32]([O:34][CH3:35])=[O:33])[C:28]([O:30][CH3:31])=[O:29])[CH2:23][CH2:22]1>C(OCC)C>[O:20]=[C:21]1[CH2:26][CH2:25][CH:24]([CH:27]([C:28]([O:30][CH3:31])=[O:29])[C:32]([O:34][CH3:35])=[O:33])[CH2:23][CH2:22]1At 5° C., a mixture of 22.7 g of sodium dichromate dihydrate, 17 ml of concentrated sulfuric acid and 113 ml of water was added dropwise to a solution of 47.7 g of dimethyl (4-hydroxycyclohexyl)malonate in 250 ml of diethyl ether. The mixture was stirred at room temperature for 4 hours, the organic phase was separated off and the aqueous phase was once more extracted with diethyl ether. The combined organic phases were dried and concentrated to give the title product as a yellow oil which was used without any further purification for the next step.
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