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Secondary phosphine oxides: tautomerism and chiral recognition monitored by multinuclear NMR spectroscopy of their Rh2[(R)-MTPA]4 adducts |
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| Authors: | Magiera Damian Szmigielska Anna Pietrusiewicz K Michal Duddeck Helmut |
| Institution: | Universit?t Hannover, Institut für Organische Chemie, Hannover, Germany. |
| Abstract: | Six secondary phosphine oxides and their tautomeric equilibria as free ligands and in the presence of an equimolar amount of the chiral dirhodium complex Rh* are described and discussed. Discrimination of enantiomers is easily possible by inspecting the (31)P NMR resonances; some (1)H and (13)C NMR resonances are useful as well. H/D exchange of the acidic protons in the phosphine oxides takes place with acetone-d(6), the solvent additive, after some hours but does not obscure the chiral recognition experiment. (103)Rh,(31)P coupling constants are discussed briefly. Decomposition of ligand molecules in 1:1-Rh*-adducts occurs slowly but completely. |
| Keywords: | secondary phosphine oxides hydroxyphosphines phosphinic acids tautomerization chiral recognition chiral dirhodium complex adducts deuterium isotope effects 31P NMR 1H NMR 13C NMR 103Rh 31P coupling constants |
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