- Novel sterically congested chiral tripodal phosphite ligands: Catalytic asymmetric hydrosilylation of ketones with a Rh(I)-TRISPHOS catalyst
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A new chiral trisphosphite ligand, (S,S,S)-2,2',2-tris(2,4,8,10-tetra- tert-butyl-dibenzo[d,f][1,3,2]dioxaphosphepin-6-yl-6-oxy)tri-2-propylamine, (S,S,S)-TRISPHOS, was synthesized and coordination chemistry investigated. The Rh(I)-(S,S,S)-TRISPHOS complexes were found to be effective catalysts for the enantioselective hydrosilylation of ketones.
- Pastor, Stephen D.,Shum, Sai P.
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- Facile phosphite to phosphonate rearrangement of a trialkanolamine-derived triphosphite promoted by triethylaluminum
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A facile room temperature rearrangement of a trialkanolamine-derived triphosphite, 1, to the monophosphonate 5 promoted by three equivalents of triethylaluminum is described. The diphosphonate 6 was prepared by the addition of three equivalents of triethylaluminum to the monophosphonate 5. A mechanism is suggested involving a transition state or intermediate with coordination of the trialkylaluminum to the migrating oxygen. Copyright Taylor & Francis Group, LLC.
- Shum, Sai P.,King III, Roswell E.,Kuell, Christopher,Rodebaugh, Ronald K.,DeBellis, Anthony D.,Pastor, Stephen D.
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p. 2611 - 2623
(2008/04/03)
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