Synthesis of the first anionic derivatives of Hf(CO)7: [(C5h5)Hf(CO)4]- and [(C5Me5)Hf(CO)4]-

Scott R. Frerichs, John E. Ellis

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Potassium naphthalenide reductions of [(C5R5)HfCl3] (R H, Me) in 1,2-dimethoxyethane at -60°C followed by carbonylation at atmospheric pressure provide 25-50% isolated yields of the first examples of carbonyl anions of hafnium(0), [(C5H5)Hf(Co)4]- and [(C5Me5)Hf(CO)4]-. These were isolated as tetraethylammonium salts as well as K(cryptand-2.2.2) and K(15-Crown-5)2+ salts for the latter anion and now represent two of only four presently known Hf0 carbonyls. They were characterized by elemental analyses, IR and 1H and 13C NMR spectra.

Original languageEnglish (US)
Pages (from-to)C41-C44
JournalJournal of Organometallic Chemistry
Issue number2
StatePublished - Jan 10 1989

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