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Condensation of appropriately substituted aldehydes and Grignard reagents leads to cyclopropyl alcohols V - VIII chromatographically separated in all cases into individual diastereoisomers. Perchloric acid catalyzed cyclopropylcarbinyl rearrangement of V - VIII (as a mixture of diastereoisomers or individual isomers) gives unsaturated monoterpenols IX - XII with high regio- and stereospecifity.

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11C Das Enol (I) des 2‐Acetyl‐cyclopentan‐1,3‐dions läßt sich in Äther mit Diazomethan zu (II) veräthern (Ausbeute 40%).