262425-49-0Relevant academic research and scientific papers
Structural and electronic impact of fluorine in the ortho positions of triphenylphosphine and 1,2-bis(diphenylphosphino)ethane; a comparison of 2,6-difluorophenyl- With pentafluorophenylphosphines
Corcoran, Christopher,Fawcctt, John,Friedrichs, Steffi,Holloway, John H.,Hope, Eric G.,Russell, David R.,Saunders, Graham C.,Stuart, Alison M.
, p. 161 - 172 (2007/10/03)
The new fluorine-containing phosphines PPh2(C6H3F2-2,6) I and PPh(C6H3F2-2,6)2 II were synthesized in high yield from C6H3BrF2-2,6 and PPh2Cl or PPhCl2. Phosphines I, II and the previously reported P(C6H3F2-2,6)3 III have been structurally characterized by single-crystal X-ray diffraction. A range of transition metal complexes of I-III and the diphosphine (C6H3F2-2,6)2PCH2CH 2P(C6H3F2-2,6)2 have been prepared and their spectroscopic properties compared with those of the analogous complexes of the pentafluorophenylphosphines PPhx(C6F5)3-x(x = 0-2) and the diphosphine (C6F5)2PCH2CH2P(C 6F5)2. The structures of trans-[PtCl2(PEt3){PPhx(C6H 3F2-2,6)3-x}] (x = 2,1 or 0), trans-[MCl(CO){PPh(C6H3F2-2,6) 2}2] (M = Rh or Ir), trans-[IrCl{(CO){P(C6H3F2-2,6) 3}2] and trans-[PtCl2{PPh-(C6H3F2-2,6) 2}2] have been determined by single-crystal X-ray diffraction. The spectroscopic and structural data indicate that the 2,6-difluorophenylphosphines are more basic than the analogous pentafluorophenylphosphines and exert a similar or slightly smaller steric influence. The Royal Society of Chemistry 2000.
