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Lookup NU author(s): Emeritus Professor Bill Clegg
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Reaction of ferrocene with 1 or 2 molar equivalents of the synergistic-operative bimetallic sodium zincate base TMEDA·Na(m-TMP)(m-tBu)Zn(tBu) yields mainly mono- or di-zincated complexes TMEDA·Na(m-TMP)[m-(C5H4)Fe(C5H5)]ZntBu (1) and [TMEDA·Na(m-TMP)Zn(tBu)]2(C5H4)2Fe (2). Likewise, the separated pairing of Li(TMP) and (TMP)AliBu2 in the presence of THF can mono- or dimetalate ferrocene in a synergistic two step lithiation/trans-metal-trapping protocol to give THF·Li(m-TMP)[m-(C5H4)Fe(C5H5)]Al(iBu)2 (4) or [THF·Li(m-TMP)Al(iBu)2]2(C5H4)2Fe (5). In the absence of Lewis donating co-solvents, a four-fold excess of the sodium zincate appears to produce an unprecedented four-fold zincated ferrocene of formula Na4(TMP)4Zn4(tBu)4[(C5H3)2Fe] (3); whereas when donor solvent is withheld from the lithium/aluminium pairing only dimetalation of ferrocene is possible. Tetrametalation seems to be inhibited by the in situ generation of TMP(H) via amido basicity which then acts as a Lewis donor towards lithium, preventing inverse-crown formation and preferentially forming the Lewis acid – Lewis base adduct [TMP(H)·Li(m-TMP)Al(iBu)2]2(C5H4)2Fe (6). With the exception of 3, all aforementioned complexes have been characterized by X-ray crystallography, while 1 - 6 have also been studied by solution NMR spectroscopic studies.
Author(s): Clegg W, Crosbie E, Dale-Black SH, Hevia E, Honeyman GW, Kennedy AR, Mulvey RE, Ramsay DL, Robertson SD
Publication type: Article
Publication status: Published
Online publication date: 04/02/2015
Acceptance date: 28/01/2015
ISSN (print): 0276-7333
ISSN (electronic): 1520-6041
Publisher: American Chemical Society
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