Structure and Reactivity of a Cobalt(I) Phthalaldehyde Complex with Both σ‐ and π‐Bonded Aldehyde Groups |
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Authors: | Christian P. Lenges Maurice Brookhart Peter S. White |
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Abstract: | A bidentate phthalaldehyde ligand with both σ and π coordination of the aldehyde groups is found in [(C5Me5)Co{(C(O)H)2C6H4}] (structure depicted). This complex is the “resting state” of the catalyst in the ring closure of the dialdehyde to give the lactone. Interchange of coordination modes occurs with a barrier of 70 kJ mol−1 at 35°C. Investigation of other CoI chelate complexes with a single aldehyde group shows that the coordination mode of the aldehyde is dictated by the nature of the bonding of the other ligating group. |
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Keywords: | Aldehydes C− H activation Cobalt Coordination modes Structure elucidation |
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