Abstract
The syntheses of the three compounds methylisonitrile tricarbonyl dicyclopentadienyl diiron, dimethylisonitrile dicarbonyl dicyclopentadienyldiiron, and trimethylisonitrile carbonyl dicyclopentadienyldiiron are described. The variable temperature pmr spectra of the first compound are presented and explained, and the mass spectra of the entire series (η5-C5H5)2Fe2(CO)4-n-(CNCH3)n = 0–3 are presented and discussed.

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