Novel Oxyfunctionalized Phosphonite Ligands for the Hydroformylation of Isomericn-Olefins

Rhodium Complexes of Sterically Demanding Diphosphonites: Coordination Chemistry and Catalysis

“…For the production of n-nonanal from isomeric n-octenes using monophosphonite 9, Börner et al reported l:b ratios of 48:52 at the maximum, with corresponding TOF's of up to 2840. 23 Van Leeuwen et al obtained turnover frequencies up to 112 h -1 for 2-octene and l:b ratios up to 95:5 with phosphacyclic diphosphines 10 derived from xanthene. 46 From the comparison with previously developed ligand systems we conclude that our novel diphosphonite ligands form rhodium complexes that are very efficient for the hydroformylation of terminal alkenes, e.g.…”

“…22 Börner et al also reported on the application of monophosphonites in the hydroformylation of 1-octene and 4-octene. 23 We were therefore interested to develop a class of diphosphonites suitable for use in these reactions. Here we wish to report on the coordination chemistry of our novel class of sterically constrained diphosphonites (Figure 2) to rhodium, with emphasis on a spectroscopic investigation of the catalytic resting state under hydroformylation conditions.…”

2-Diphenylphosphino-2′-hydroxybiphenyl-based P-ligands and their platinum(II) complexes

“…Hence, driven by green chemistry, the development of new monodental and bidental P-ligands and their complexes remains a challenge for organic chemists. The family of dibenzo[c.e] [1,2]oxaphosphorines with a P(III) function represents a typical class [2][3][4]. Recently, P-aryl-, P-alkoxy-and P-amino derivatives, as well as their platinum complexes including chiral derivatives have been introduced [5][6][7].…”

New Phosphorus Ligands for the Rhodium-Catalyzed Isomerization/Hydroformylation of Internal Octenes

“…[2] The low isomerization activity of the catalyst however, resulted in turnover frequen-were carried out on an AMX600 NMR spectrometer (Bruker, Karlsruhe, Germany) equipped a 5 mm triple-resonance probehead with z-gradients. [3] New developments in the rhodium-catalyzed oxo reaction (hydroformylation) of long-chain internal olefins have to show a clear improvement in the n-selectivity and a catalytic activity of practical use. For amino acid analysis with GC-MS (HP 5973/ HP 6890, Agilent Technologies, Waldbronn, Germany), the peptides were hydrolyzed under vacuum (6 n HCl containing 5 % phenol, 110 8C, 24 h) and derivatized with methanol/HCl (2 n, 110 8C, 15 min), trifluoroacetic anhydride (110 8C, 10 min), and then BSTFA/HMDS/pyridine (4:1 cies of only 15 h À1 (112 h À1 for 2-octene) and thus no effective control of the reaction.…”

“…[1] A continuously increasing number of publications indicates that sol ± gel processing as a method to produce oxide materials is still gaining importance. [3] A sol ± gel route to B/(C)/N materials was found in the 1980s by Paine and Narula et al which is based on ªsilazanolysesº of B-trichloroborazenes with hexa-(HMDS) or heptamethyl disilazane. [3] A sol ± gel route to B/(C)/N materials was found in the 1980s by Paine and Narula et al which is based on ªsilazanolysesº of B-trichloroborazenes with hexa-(HMDS) or heptamethyl disilazane.…”