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 pentafluorophenyl-phosphines

Autor:	Christopher Corcoran, Graham C. Saunders, Eric G. Hope, Alison M. Stuart, John H. Holloway, Steffi Friedrichs, David R. Russell, John Fawcett
Rok vydání:	2000
Předmět:	Steric effects Stereochemistry chemistry.chemical_element General Chemistry Crystal structure Medicinal chemistry Oxidative addition chemistry.chemical_compound 1 2-Bis(diphenylphosphino)ethane chemistry Transition metal Tris(pentafluorophenyl)phosphine Fluorine Triphenylphosphine
Zdroj:	Journal of the Chemical Society, Dalton Transactions. :161-172
ISSN:	1364-5447 1470-479X
Popis:	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 IIII and the diphosphine (C6H3F2-2,6)2PCH2CH2P(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 = 02) and the diphosphine (C6F5)2PCH2CH2P(C6F5)2. The structures of trans-[PtCl2(PEt3){PPhx(C6H3F2-2,6)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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::42076542c64fb537affdc5b678594c0e https://doi.org/10.1039/a907759f Zobrazit plný text záznamu