PREPARATION AND REACTIVITY OF THE NEW CYCLOPENTADIENYL-BRIDGED COMPLEX (Me2SiCH2CH2SiMe2)(C5H4Fe(CO)2)2

Article abstract of DOI:10.1016/0022-328X(83)87157-5

A new metal-metal bonded binuclear iron system <η⁵-C5H4Fe(CO)2>2 (2) has been prepared by treating two equivalents of NaCp with one equivalent of ClSi(Me)2CH2CH2SiClMe2 obtaining the intermediate (C5H5)Si(Me)2CH2CH2Si(Me)2(C5H5) which then is directly allowed to react with Fe(CO)5 giving 2 in 30percent yield.From this cyclopentadienyldisilyl linked system three new binuclear iron complexes are formed.Treatment of 2 with Na/Hg in THF produces the dianion <η⁵-C5H4Fe(CO)2^->2 which is quenched with CH3I giving <η⁵-C4H4Fe(CO)2CH3>2 (4) in 76percent yield.Complex 2 is oxidized with 1.2 equivalent of I2 to give <η⁵-C5H4Fe(CO)2I>2 (5) in 85percent yield.Photolysis of 5 (1 equiv.) and PPh3 (3 equiv.) results in the formation of the bis-substituted compound <η⁵-C5H4Fe(CO)(PPh3)I>2 (6).These four new binuclear iron complexes are characterized by 1H, 13C, and 31P NMR and IR spectroscopy.