- π Coordination of unsaturated bonds containing heteroatoms. II. Iron carbonyl complexes of azomethine analogs of 1,3-dienes. Preparation and nature of the coordination bondings
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The following mononuclear iron carbonyl complexes were prepared: (cinnamaldehydeanil)iron tricarbonyl (1), (crotonaldehyde-n-butylimine)iron tricarbonyl (2), (cinnamaldehydeanil)(triphenylphosphine)iron dicarbonyl (3), (diacetylanil)-iron tricarbonyl (4), and (diacetyl-n-butylimine)iron tricarbonyl (5). On the basis of the nmr spectra, it was inferred that the coordination of the enimine ligands in 1, 2, and 3 may be of π-1,3-diene type, analogous to butadiene iron tricarbonyl, while the α-diimine in 4 and 5 coordinates through its nitrogen lone pairs forming a chelate ring similar to the well-known α-diimine Fe(II) chelate complexes. Attempted preparations of (π-benzalazine)- or (π-acetalazine)iron carbonyl complexes were unsuccessful.
- Otsuka, Sei,Yoshida,Nakamura
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