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Inter- versus Intraannular Ring-Closing Metathesis of Polyallylferrocenes: Five-Fold RCM within a Single Molecule

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posted on 2013-11-11, 00:00 authored by Masamichi Ogasawara, Wei-Yi Wu, Sachie Arae, Kiyohiko Nakajima, Tamotsu Takahashi
Treatment of decaallylferrocene (1) with the Grubbs-II catalyst in refluxing dichloromethane has promoted the 5-fold ring-closing metathesis in 1 to afford single-bridged bis­(1,4,5,8-tetrahydrofluorenyl)­iron­(II) species 3 in excellent yield. The preferential formation of 3 over quintuply bridged “superferrocenophane” 2 was explained as the intraannular RCM process being preferred over the interannular one in the reactions of polyallylferrocenes.

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