Abstract
Reaction of [(η5-C5H4Me)4Fe4(HCCH)(HCC–Br)](PF6) with NEt3 in acetonitrile gave the cyanomethylated product [(η5-C5H4Me)4Fe4(HCCH)(HCC–CH2CN)](PF6), while that in dichloromethane gave the [4Fe–4C]-substituted enamine [(η5-C5H4Me)4Fe4(HCCH)(HCC–CH=CHNEt2)](PF6). A possible mechanism starts from the Lewis acid–base interaction between the cationic [CCH] subunit and NEt3 on the tetrairon core.
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