Highly Reduced Organometallics. 16. Synthesis, Isolation, and Characterization of the Tricarbonylcyclopentadlenylmetalate(2-) Anions of Niobium and Tantalum, C5H5M(CO)32-

Kathryn M. Pfahl, John E. Ellis

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

Treatment of C5H6M(CO)4 (M = Nb, Ta) with sodium in liquid ammonia at-78 °C generates the corresponding disodium salts Na2[C6H6M(CO)3], which have been spectroscopically identified. Cesium iodide reacts with Na2[C5H6M(CO)3] in liquid ammonia to provide 70-80% isolated yields of pale orange, air-sensitive solids that analyze satisfactorily as the unsolvated dicesium salts Cs2[C6H6M(CO)3]. These are the first isolated salts containing the tricarbonylcyclopentadienylmetalate dianions of niobium and tantalum. Reactions of C5H5M(CO)32- with CH3CN, Et4N+, or other weak Bronsted acids or Ph3SnCl provide, after cation exchange, 40-70% isolated yields of [Et4N] [C6H6M(CO)3H] or [Et4N][C5H5M(CO)3SnPh3], which are characterized by elemental analyses and 1H and NMR spectra.

Original languageEnglish (US)
Pages (from-to)230-233
Number of pages4
JournalOrganometallics
Volume3
Issue number2
DOIs
StatePublished - Jan 1984

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