3135-67-9Relevant academic research and scientific papers
Rhodium catalyzed hydroformylation assisted by cyclodextrins in biphasic medium: Can sulfonated naphthylphosphanes lead to active, selective and recyclable catalytic species?
Elard, Maxime,Denis, Julien,Ferreira, Michel,Bricout, Hervé,Landy, David,Tilloy, Sébastien,Monflier, Eric
, p. 47 - 54 (2015/03/30)
New sulfonated naphthylphosphanes having an average sulfonation degree around 2 have been synthetized and tested as ligand in the aqueous biphasic Rh-catalyzed hydroformylation of 1-decene assisted by randomly methylated β-cyclodextrins. All these water-soluble phosphanes associated to a rhodium precursor were able to perform aqueous hydroformylation of 1-decene. The best results in terms of catalyst recovery and recycling were obtained with sulfonated 2-naphthylphosphanes. With sulfonated 1-naphthylphosphanes, formation of low-coordinated catalytic species leading to a catalyst leaching in the organic phase was postulated. These results were rationalized by considering that sulfonated 1-naphthylphosphanes are bulkier ligands than sulfonated 2-naphthylphosphanes.
SYNTHESIS AND MOLECULAR STRUCTURES OF FLUOROPHOSPHORANES, R3PF2, ISOELECTRONIC WITH ANIONIC FLUOROSILICATES
Holmes, Robert R.,Holmes, Joan M.,Day, Roberta O.,Swamy, K. C. Kumara,Chandrasekhar, V.
, p. 153 - 170 (2007/10/02)
The new difluorophosphoranes Ph(o-Tol)2PF2 (1), Mes3PF2 (2), Ph(1-Np)2PF2 (3), (o-Tol)3PF2, (p-Tol)3PF2, Ph(t-Bu)2PF2, and (Ph2PF2)2CH2 containing bulky substituents were prepared by the fluorination reaction of precursor organophosphines with dimethylaminosulfur trifluoride.They were characterized by 1H, 31P, and 19F NMR spectra.The molecular structures of 1-3 revealed trigonal bipyramidal geometries.Comparison of the structural data with that of isoelectronic anionic fluorosilicates along with the NMR data suggest the operation of a steric effect that increases bond lengths in the difluorophosphoranes 1-3 and in related anionic silicates.The data are discussed relative to enhanced reactivity observed for anionic silicates. 1 cryatallizes in the monoclinic space group C2/c with a = 11.819(3) Angstroem, b = 10.163(2) Angstroem, c = 13.992 Angstroem, β = 99.14(2) deg, and Z = 4. 2 crystallizes in the monoclonic space group C2/c with a = 10.531(2) Angstroem, b = 12.667(2) Angstroem, c = 18.110(4) Angstroem, β = 104.21(2) deg, and Z = 4. 3 crystallizes in the monoclinic space group P21/c with a = 15.868(2) Angstroem, b = 7.434(1) Angstroem, c = 18.213(4) Angstroem, β = 112.34(2) deg, and Z = 4.The final conventional unweighted residuals are 0.063 (1), 0.060 (2), and 0.040 (3).Key words: Difluorophosphoranes, anionic fluorosilicates, x-ray structures, NMR spectra
