26040-41-5Relevant academic research and scientific papers
Electrophilic bis-fluorophosphonium dications: Lewis acid catalysts from diphosphines
Holthausen, Michael H.,Hiranandani, Rashi R.,Stephan, Douglas W.
, p. 2016 - 2021 (2015/08/18)
Stepwise oxidation of 1,8-bis(diphenylphosphino)naphthalene and a series of (oligo)methylene-linked diphosphines with XeF2 followed by fluoride abstraction yields a family of compounds featuring phosphine, phosphonium and phosphorane moieties in close proximity. The bisphosphonium ions [(C10H6)(Ph2PF)2]2+ (5) and [CH2(Ph2PF)2]2+ (9a) exhibit remarkable Lewis acidity arising from the proximity of the phosphonium centers. The effectiveness of bisphosphonium dications (5, 9a-e) is examined in a series of Lewis acid catalysed transformations.
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
CARBONYL DIFLUORIDE: REACTIONS WITH METAL-PHOSPHINE COMPLEXES
Gupta, O. D.,Kirchmeier, Robert L.,Shreeve, Jean'ne M.
, p. 1 - 6 (2007/10/02)
Nickel complexes of the composition X2 were allowed to react with carbonyl difluoride under
