Intramolecular cyclisation of 1,1′,3,3′- tetramethyl-1,1′-bi-indenyl

Abstract
The intramolecular cyclisation of 1,1′, 3,3′-tetramethyl-1, 1′-bi-indenyl occurs when TiCl4 is used as a catalyst, thus explaining certain unexpected aspects of the polymerisation of 1,1′-bi-indenyl.

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