Metals to Cyclopentadienyl Rings

The reaction of dihexylfulvalene dianion with [FeCl2(THF)2] has reportedly produced oligomeric and polymeric polyferrocenylenes substituted with hexyl groups, as shown in scheme 14. High molecular weight polymers could not be 

Using an isomeric mixture of bis(alkylcyclopentadienide)arenes with ferrous iodide, Southard and Curtis reported the synthesis of conjugated polymers, as shown in scheme 15. Polymers 48a,b were high molecular weight with high 

Rosenblum and coworkers reported the synthesis of face-to-face polymetallocenes via the methodology described in scheme 16. Paramagnetic mixed-metal polymers containing nickel and iron or cobalt and iron were also synthesized. The magnetic moments of these polymers were 5.3 and 5.2 /Xb, respectively. 

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