Rhodium-catalyzed hydroformylation of olefins: Effect of [bis(2,4-di-tert-butyl) pentaerythritol] diphosphite (alkanox P-24) on the regioselectivity of the reaction
作者:Jimoh Tijani、Bassam El Ali
DOI:10.1016/j.jorganchem.2007.04.022
日期:2007.7
pentaerythritol] diphosphite (I) as a ligand represents an active catalyst system for highly regioselective hydroformylation of various alkenes. The commercially available bis(2,4-di-tert-butyl)pentaerythritol diphosphite (alkanox P-24) (I), which has been used so far as an antioxidant in the stabilization of polymers, was used as a diphosphite ligand for the selective hydroformylation reaction of olefins
Cationic rhodium(I) complexes containing 4,4′-disubstituted 2,2′-bipyridines: A systematic variation on electron density over the metal centre
作者:Paulo E.A. Ribeiro、Claudio L. Donnici、Eduardo N. dos Santos
DOI:10.1016/j.jorganchem.2005.12.049
日期:2006.4
A series of [Rh(COD)(X-2-bipy)]BF4 complexes (COD = 1,5-cyclooctadiene; X-2-bipy = 4,4'-disubstituted 2,2'-bipyridines; X = OCH3, CH3, H, Cl or NO2) has been prepared from [Rh(COD)Cl](2). The complexes for X = OCH3, Cl and NO2 have not been described previously in the literature. All complexes have been characterised by elemental analysis, IR, H-1 NMR and UV-Vis spectrometry. This series of complexes presents a wide variation on electron density over the metal centre with virtually no variation on its steric environment which discloses interesting possibilities for catalytic and electro-catalytic studies. A preliminary evaluation of these complexes on the hydroformylation of camphene and beta-pinene showed that under the rather drastic conditions employed the complexes acted as a precursor for (Rh(CO)(3)H], which accounts for most of the catalytic activity. (c) 2006 Elsevier B.V. All rights reserved.
δ-Santalolanaloga I Synthesen in der Isocamphanreihe, 27. Mitt.