11. For example, in ferrocene , iron ( II ), ferrous iron is present. 12. The half-life for ferrocene liberation is 19.6 hours at 112 �C. 13. These data clearly indicate the stability of neutral ferrocene and the cobaltocenium and rhodocenium cations. 14. It consists of ferrocene substituted by an acetyl group on one of the cyclopentadienyl rings. 15. Direct transmetalation can also be used to prepare ferrocene from other metallocenes, such as manganocene: 16. The structure is similar to ferrocene . 17. Consequently, the Co C distances are slightly longer than the Fe C bonds in ferrocene . 18. The greater size of Hf may diminish HfCl 4's tendency to complex to ferrocene . 19. Ferrocene is often used as an internal standard for calibrating redox potentials in non-aqueous electrochemistry.20. For example, ferrocene is alkylated with allyldimethylchlorosilane more efficiently using hafnium chloride relative to aluminium trichloride.
