Hydroformylation of styrene using thiolato-pyrazolate bridge rhodium catalysts modified with phosphorous ligands
- Orejón, A. 1
- Claver, C. 1
- Oro, L.A. 3
- Elduque, A. 3
- Pinillos, M.T. 2
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1
Universitat Rovira i Virgili
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2
Universidad de La Rioja
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3
Instituto de Nanociencia y Materiales de Aragón
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ISSN: 1381-1169
Datum der Publikation: 1998
Ausgabe: 136
Nummer: 3
Seiten: 279-284
Art: Artikel
Andere Publikationen in: Journal of Molecular Catalysis A: Chemical
Zusammenfassung
Catalytic precursor systems prepared using [Rh2(μ-pz)(μ- SBu')(COD)2] in the presence of triphenylphosphine and chiral diphosphines are active in styrene hydroformylation. The effect of the pressure and the dependence on the P/Rh ratio are studied. When triphenylphosphine is used as phosphorous ligand complete conversion to aldehydes and regioselectivities as high as 90% in 2-phenylpropanal are obtained at very mild conditions. The use of (+)-(2R,4R)(-)-(2S,4S)-2,4-bis(diphenylphosphino)pentane ((+)-BDPP) or (- )-(2S,4S) ((-)-BDPP) as chiral diphosphine in a P/Rh ratio of 2 provides 95% regioselectivity and enantiomeric excess as high as 50%.