,F? + O BF3‐H3P0u II Die Alkylierung der Benzole (I) mit Cyclopenten (II) in Gegenwart von Bortri‐ fluorid‐Phosphorsäure (Molverhältnis optimal wie 5:1 :0,3) bei 20‐60°C liefert Gemische der Cyclopentylbenzole (III) (Ausbeute 80‐88%); entsprechende Di‐ Cyclopentylbenzole entstehen in nur geringen Mengen (6‐12%).
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