Previous synthetic routes to create ansa-metallocenes have used expensive reagentsand/or generate products in low yields. Lithium cyclopentadienide reacts with succinyl chloride at a -78 �C to produce 1,4-dicyclopentadienyl-1,4-butandione, which is then reduced via aWolff-Kishner reduction in order to create 1,4-dicyclopentadienbutane. This material was treated with two equivalents of n-butyllithium, followed by overnight reflux with FeCl2 to yield the desired ansa-metallocene. In addition, the bis(tetramethylcyclopentadienyl) derivative of this compound was prepared by an analogous series of reactions.

New synthesis of ansa-ferrocene

246th National Meeting (2013)

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