Fluorination of derivatives of tri- and pentavalent phosphorus acids by perfluoropropylene oxide
摘要:
Perfluoropropylene (I) efficiently fluorinates esters and ester anhydrides of P(III) and P(V) acids to give acid fluoride derivatives of pentavalent phosphorus acids. Phosphites are initially oxidized to the corresponding phosphoryl compounds with subsequent substitution of the oxygen by two fluorine atoms by means of excess oxide (I).
Molecular structures and reactivity of trifluoromethyltris(dialkylamino)phosphonium bromides
摘要:
Hexa-alkylphosphorus triamides and trifluoromethyl bromide react to give trifluoromethyltris(dialkylamino) phosphonium bromides which were used for the trifluoromethylation of benzaldehyde and copper(I) iodide in the presence of fluoride anions with different counterions; tris(diethylamino)difluorophosphorane proved to be a masked fluoride anion donor. The structures of [CF3P(NMe(2))(3)]Br-+(-) and [CF3P(NEt(2))(3)]Br-+(-) have been determined by single-crystal X-ray investigations and shown to exhibit a distorted tetrahedral bond configuration with a rather long (F-3)C-P bond of 1.866(9) or 1.896(6) Angstrom, respectively.
Simple preparation of difluorophosphoranes using anhydrous zinc and tetramethylammonium fluorides
作者:Alexander A. Kolomeitsev、Frank U. Seifert、Gerd-Volker Röschenthaler
DOI:10.1016/0022-1139(94)03150-x
日期:1995.3
(R=nBu, NMe2, NEt2) are easily fluorinated using zinc difluoride in pyridine or tetramethylammonium fluoride in methylene chloride to give the corresponding difluorophosphoranes R3PF2 in high yield. A simple procedure for preparing pure tetramethylammonium fluoride is described.
Interaction of α,α-difluoroazides with trivalent phosphorus compounds and triphenylantimony
作者:S. A. Lermontov、A. G. Polivanova、S. B. Shkavrov
DOI:10.1134/s1070363210080141
日期:2010.8
alpha,alpha-Difluoroazides react with triphenylantimony and various compounds of trivalent phosphorus according to the oxidative fluorination scheme. In the case of trivalent phosphorus compound the primary products are phosphazenes, phosphazides or difluorophosphoranes that may undergo further transformations to the corresponding fluorine derivatives of pentavalent phosphorus.