Abstract
1,1-Bis(1″,2″,3″,4″,5″-pentamethylferrocen-1′-yl)ethene ( 6) was synthezised as a prototype of two metallocenes that are bridged by the sp 2-carbon center of a vinylidene group. Starting from 6- N, N-dimethylamino-6-methylfulvene, the iron-containing intermediates were a pentamethylferrocenyl-substituted fulvene and an ethene that was geminally disubstituted by a Cp anion and a pentamethylferrocenyl moiety. Besides other methods, the ferrocenes were characterized by NMR spectroscopy including full signal assignment. The bimetallic compound 6 showed moderate interactions between the two ferrocenes in the cyclic voltammogram (Δ E 1/2=150 mV). According to X-ray crystal structure analysis compound 6 is a twisted molecule; the vinylidene moiety and the Cps of the neighboring ferrocenes are not coplanar.
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