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Cyanohydrins 2 of O-protected 4-hydroxycyclohexanones 1 are excellent starting compounds for the synthesis of Isorengyol (I) and Rengyol (II). The cyano group of the O-benzyl derivative 2d is first converted into the corresponding aldehyde 4, which via Wittig olefination led to the vinyl compound 6. Hydroboration of the trans-derivative (trans-6) leads, after debenzylation, to Isorengyol, whereas...
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