Organoethynylxenon(II) Tetrafluoroborates, [RC≡CXe][BF₄] – The First Examples of Isolated Alkynylxenonium Salts: Preparation and Multi‐NMR Characterisation

Xenon(IV)–Carbon Bond of [C6F5XeF2]+; Structural Characterization and Bonding of [C6F5XeF2][BF4], [C6F5XeF2][BF4]·2HF, and [C6F5XeF2][BF4]·nNCCH3(n= 1, 2); and the Fluorinating Properties of [C6F5XeF2][BF4]

“…An impressive variety of Xe II –C-bonded compounds are now known, which include not only xenonium salts having the formulations [RXe][A] (R = aryl, − alkenyl, − and alkynyl, − A = anion) but also neutral XeAr 2 and ArXeZ (Ar = aryl, Z = F or Cl) species, which are exemplified by Xe(C 6 F 5 ) 2 , − C 6 F 5 XeCl, and C 6 F 5 XeF . More recently, the syntheses of the dicationic salt, [XeC 6 F 4 Xe][BF 4 ] 2 , and the zwitterionic compound, XeC 6 F 4 BF 3 , along with their solution characterizations by 13 C, 19 F, and 129 Xe NMR spectroscopy, were reported …”

Reactions of Perfluorinated Alkenyl‐, Alkynyl‐, Alkyltrifluoroborates, and Selected Hydrocarbon Analogues with the Halogenating Agents Hal2 (Hal = F, Cl, Br), “BrF” (BrF3–Br2 1:1), and ICl

“…When XeF 2 was reacted with R CF=CFBF 2 ( R = H, F, cis ‐CF 3 , cis ‐C 2 F 5 ) in halocarbon solvents (CH 2 Cl 2 , CF 3 CH 2 CF 2 CH 3 ) xenonium salts [ R CF=CFXe] X were formed with two types of anions, X = [BF 4 ] – and [ R CF 2 –CF 2 BF 3 ] – 13. Analogous products were observed in the reaction of XeF 2 with CF 2 =CClBF 2 in PFB,14 whereas no organyltrifluoroborate anions were formed in reactions of alkynyldifluoroboranes R C≡CBF 2 [ R = CF 3 , C 3 F 7 , (CF 3 ) 2 CF, CF 3 CF=CF ( cis and trans ), C 6 F 5 , C 4 H 9 , (CH 3 ) 3 C] with XeF 2 under similar conditions 15…”

Halogens and noble gases

“…69 The reaction of RBF 2 compounds with XeF 2 has proved to be a remarkably powerful method for the synthesis of organoxenon compounds of the type [RXe] + [BF 4 ] À . This methodology has now been applied to the synthesis of [RCCXe][BF 4 ] where R = CF 3 , C 3 F 7 , (CF 3 ) 2 CF, cis and trans-CF 3 CFQCF, C 6 F 5 as well as the non-fluorinated groups C 4 H 9 and (CH 3 ) 3 C. 70 The resulting xenonium salts were characterised in solution by 1 H-, 11 B-, 13 C-, 19 A number of metal complexes that contain XeF 2 as a ligand have been reported previously and the area has been reviewed this year. 73 Full details of the first such complexes possessing the PF 6…”