New C 2-symmetric cyclopentadiene dimer from sodium naphthalenide reduction of 1,3,6-tri- tert -butylfulvene (original) (raw)

Acta Crystallographica Section E Structure Reports Online, 2002

Abstract

The sodium naphthalenide reduction of 1,3,6-tri-tert-butyl­fulvene gave the dimer, rac-3,4-bis(1,4-di-tert­butyl­cyclo­penta-1,3-dien-2-yl)-2,2,5,5-tetra­methyl­hexane [C36H62, (II)] after protonation of the disodium salt of the bis­(cyclo­penta­dienyl­ethane) intermediate. Bond distances and angles for (II) are consistent with a bis­(cyclo­penta­diene) structure. The ansa bridge bond is long, at 1.592 (2) A. The substitution pattern on the cyclo­penta­diene rings, as well as the ansa bridge, result in an overall C2 symmetry for (II).

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