Die aus dem Tosylat (I) durch Malonester‐Kettenverlängerung erhaltene Säure (IIa) liefert bei der Li‐Al‐hydrid‐Reduktion den Alkohol (IIb), dessen Li‐Verbindung mit p‐Brom‐benzolsulfonylchlorid in den Ester (IIc) übergeführt wird.
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