From functional phospholide ions to bifunctional 1,1′- diphosphaferrocenes
Organometallics, ISSN: 0276-7333, Vol: 27, Issue: 8, Page: 1887-1891
2008
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- 7Captures
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Article Description
Both the 2-ethoxycarbonyl and the 2-benzoyl phospholides (1 and 2) react with FeCl in the presence of ZnCl to give the corresponding 2,2′-difunctional 1,1′-diphosphaferrocenes as mixtures of meso and rac diastereomers. Stable rotamers are also detected by H and C NMR spectroscopy. Under the same conditions, the 2,5-bis(ethoxycarbonyl)phospholide (3) gives the tetrafunctional 1,1′-biphospholyl (6). The diphosphaferrocenes and the 1,1′-biphospholyl are probably formed from a common type of intermediates with a bis(η-phospholyl)iron structure. DFT computations indicate that this kind of intermediate is pyramidal at P and only weakly aromatic. © 2008 American Chemical Society.
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