Methyl 4-tolyl (R)-sulfoxide can be used to oxidize (±)-borneol by the carbodiimide–sulfoxide procedure: (−)-camphor is formed in low optical yield; and the residual borneol is correspondingly enriched with its (+)-(1R,2S,4R)-enantiomer.
Bei der Oxidation von (i)‐Borneol (I) mit (R)‐(+)‐Methyl‐[p‐tolyl]‐sulfoxid (II) und Dicyclohexylcarbodiimid (III) in Gegenwart von H3PO4 (Molverhältnis wie l:2:3:1) in Benzol bei 85°C entsteht bevorzugt (‐)‐Campher (IV) (optische Reinheit etwa 7%).
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