Communication
Dalton Transactions
alkyl ligands that feature oxygen donors and are capable of
7 (a) M. L. H. Green, J. Organomet. Chem., 1995, 500, 127–
148; (b) G. Parkin, in Comprehensive Organometallic Chem-
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t
forming metallacarbatranes, as exemplified by [κ4-TpomBu ]-
t
ZnOC6H4But. In addition, the [TpomBu ] ligand also allows iso-
t
lation of a monovalent thallium alkyl compound, [TpomBu ]Tl,
in which the Tl–C bond is long and has little covalent
character.
8 (a) J. G. Verkade, Coord. Chem. Rev., 1994, 137, 233;
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We thank the National Science Foundation (CHE-1058987)
for support of this research. A.A.-H. thanks the Government of
Saudi Arabia for a scholarship. Serge Ruccolo is thanked for
help with pulsed gradient spin-echo diffusion NMR spectro-
scopic experiments.
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10 For an example of a tetradentate tripodal X4 ligand in phos-
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J. Kobayashi, K. Goto, T. Kawashima, M. W. Schmidt and
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14056 | Dalton Trans., 2013, 42, 14053–14057
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