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Diferrocenylmethylium cation with chloride or tetraphenylborate as counter-ion is prepared from diferrocenylmethanol by dehydration with strong acids. Treatment with trimethylchlorosilane removes residual water to afford anhydrous methylium salts, which are highly reactive electrophiles for alkylation of group 14 (carbanions), group 15 (amines), group 16 (alkoxides), and, remarkably, group 17 (fluoride)...
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