Experimental study demonstrates chelate complexation of phosphanyl phosphaferrocenes with molybdenum tetracarbonyl, indicating versatile bidentate ligand coordination behavior.
Dicyclohexyl‐acid diphenylphosphanyl‐substituted phosphaferrocenes 2 and 3 were synthesized by substitution of the amino group in 2‐dimethylaminomethyl‐3,4,‐dimethylphosphaferrocene 1 · Homologization of 2‐formyl‐3,4‐dimethylphosphaferrocene 4 by one CH2 unit via Wittig olefination provided access to the phosphanylethyl derivative 9. Ligands 2, 3 and 9 formed P, P‐chelate complexes with tetracarbonyl metal fragments in good yield. X‐ray crystal structure determinations were carried out for the five‐ring chelate complex 2. Mo(CO)4 (≡ l0), and the six‐ring chelate complex 9 . Mo(CO)4, (≡ 13).
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Ganter et al. (1997) studied this question.
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