Synthesis and crystal structure of the double cluster [Cp 3Fe 4(CO) 4(C 5H 4)] 2( p-C 6H 4)

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[Cp 4Fe 4(CO) 4] ( 1) reacts with p-BrC 6H 4Li and MeOH in sequence to afford the functionalized cluster [Cp 3Fe 4(CO) 4(C 5H 4- p-C 6H 4Br)] ( 2), while the reaction of 2 with n-BuLi and MeOH produces [Cp 2Fe 4(CO) 4(C 5H 4Bu)(C 5H 4- p-C 6H 4Br)] ( 3). The double cluster [Cp 3Fe 4(CO) 4(C 5H 4)] 2( p-C 6H 4) ( 4) has been prepared by treatment of [Cp 4Fe 4(CO) 4] with p-C 6H 4Li 2 and MeOH in sequence. The electrochemistry of 2 and 4, as well as the crystal structure of 4 have been investigated.