New base-free metallocenes of samarium and neodymium, an approach to stereoelectronic control in organolanthanide chemistry

Abstract
New unsolvated metallocenes of early lanthanides, (Cp4i)2Sm, COTSmCp4i, and COTNdCp41 (Cp4i = C5HiPr4) have been prepared and fully characterised, including X-ray structural analysis: the absence of ancillary base in these complexes is not only the consequence of steric effects; these results bring up the debated question of electronic control in organolanthanide chemistry.

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