Calcium and strontium diiodide react with 2,5-di-tert-butylpyrrolylsodium in THF yielding [M(pyr*)2(THF)] (M = Ca, Sr; pyr* = NC4H2But2-2,5) for which NMR spectra and the X-ray structures confirm the η5-bonding character of the ligands.
H. Schumann, J. Gottfriedsen and J. Demtschuk, Chem. Commun., 1999, 2091 DOI: 10.1039/A906654C
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