Probing new classes of π-acceptor ligands for rhodium catalyzed hydroformylation of styrene

• Verfasst von: Breit, Bernhard [VerfasserIn]
• Titel: Probing new classes of π-acceptor ligands for rhodium catalyzed hydroformylation of styrene
• Verf.angabe: Bernhard Breit
• Umfang: 12 S.
• Fussnoten: Gesehen am 21.03.2018
• Titel Quelle: Enthalten in: Journal of molecular catalysis / A
• Jahr Quelle: 1999
• Band/Heft Quelle: 143(1999), 1/3, S. 143-154
• DOI: doi:10.1016/S1381-1169(98)00377-X
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1571293191

Abstract

Three hitherto unexplored classes of strong π-acceptor ligands for use in homogeneous catalysis—phospha-π-aromatic compounds (class A), pyrrolyl phosphines (class B) and phosphenium cations (class C)—have been evaluatated for rhodium catalyzed hydroformylation of styrene. When testing monodentate ligands, the ortho/ortho′-disubstituted phosphabenzene derivative 1b provided a rhodium-catalyst endowed with the highest catalytic activity. Based upon these results a first series of bidentate phosphabenzene ligands have been tailored employing the concept of an electronic differentiation of the two binding sites. An oxazoline/phosphabenzene system 8 which is capable of forming an eight-membered chelation ring gave the best results. Thus, a quantitative conversion of styrene at ambient temperature afforded the desired 2-phenylpropanal in high regioselectivity (25:1).