Abstract
AbstractAllen (I) cyclooligomerisiert bei leichtem Erwärmen in Benzol in Gegenwart von Dicyclooctadien‐(1,5)‐Nickel(0) [Ni(cod)2] und eines Austauschliganden (Triphenylphosphin, Tri‐n‐butylphosphin, Tri‐o‐tolyl‐phosphit, bei ‐78°C zugesetzt) zu den Ver‐ ′ bindungen (II)‐(IV) (Gesamtausbeute 93‐100%), in Abwesenheit eines zusätzlichen Liganden aber zu dem Pentameren (IV) als einzigem Produkt (52%).
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