110414-99-8Relevant academic research and scientific papers
From functional phospholide ions to bifunctional 1,1′- diphosphaferrocenes
Escobar, Aholibama,Donnadieu, Bruno,Mathey, Francois
, p. 1887 - 1891 (2009/02/02)
Both the 2-ethoxycarbonyl and the 2-benzoyl phospholides (1 and 2) react with FeCl2 in the presence of ZnCl2 to give the corresponding 2,2′-difunctional 1,1′-diphosphaferrocenes as mixtures of meso and rac diastereomers. Stable rotamers are also detected by 1H and 13C 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(η1-phospholyl)iron structure. DFT computations indicate that this kind of intermediate is pyramidal at P and only weakly aromatic.
