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Polyfluoroorganotrifluoroborates and -difluoroboranes: interesting materials in fluoroorgano and fluoroorgano-element chemistry

“…Recently we have reported a convenient access to the class of fluorophenyl(pentafluorophenyl)iodonium tetrafluoroborate salts [14]. The salts [C 6 H 5Àn F n (C 6 F 5 )I][BF 4 ] with n = 0, 1, 2, 3, and 5 were obtained in good yields and high purity by the reaction of C 6 F 5 IF 2 with the boranes C 6 H 5Àn F n BF 2 (Eq.…”

“…Here we have observed a principal deviation from Eq. (14). Despite of optimal local concentrations during the reaction (a very diluted (4-C 5 F 4 N)BF 2 solution in CH 2 Cl 2 was added to ca.…”

Polyvalent perfluoroorgano- and selected polyfluoroorgano-halogen(III and V) compounds

“…A straightforward preparative approach to per-and polyfluoroorganodifluoroboranes R F BF 2 (R F = C 6 F n H 5Àn , R 00 CF = CF, CF 2 = CR 00 , R 00 CBBC) in weakly coordinating solvents (CH 2 Cl 2 , 1,1,1,3,3-pentafluoropropane (PFP), 1,1,1,3,3-pentafluorobutane (PFB)) was developed by Frohn and Bardin in the last decade [63,64] and allowed the syntheses of a number of symmetric and asymmetric bis(per-and polyfluoroaryl)iodonium (Eqs. (39a) and (39b)) [65,21,66], perfluoroalkenyl(aryl)iodonium (Eq. (39c)) [21,66], perfluoroalkynyl(aryl)iodonium, perfluoroalkynyl(perfluoroalkenyl)-iodonium, perfluoroalkynyl(polyfluoroalkyl)iodonium (Eq.…”

“…More different types are known with a C 6 F 5 group bonded to Hal(III and V). Besides the molecules C 6 F 5 IF 2 [10], C 6 F 5 IF 4 [80], C 6 F 5 I(OC(O)CF 3 ) 2 [134], and C 6 F 5 I(OC(O)C 6 F 5 ) 2 [135] (Table 2) salts with the cations [(C 6 F 5 ) 2 I] + [65] and [(C 6 F 5 ) 2 IF 2 ] + [26,113] were structurally characterised as well as bromonium salts with the related [(C 6 F 5 ) 2 Br] + cation [86] (Table 3). In case of CF 3 IX 2 molecules, CF 3 IF 2 shows the shortest average C-I distance and CF 3 ICl 2 the longest.…”

“…Thus, the deshielding Dd(C 1 ) in [(C 6 F 5 ) 2 Hal][BF 4 ] are only 6 (Hal = Br) and 22 (Hal = I) ppm(Table 1). Asymmetric pentafluorophenyliodonium salts, [C 6 F 5 (R 0 )I][BF 4 ],[65] show similar values of Dd(C 1 ) = 20-22 ppm, practically independent of the nature of the second ligand R 0 (Table 1). The resonances of C 1 and C 2 of perfluoroalkynyliodonium salts [(R F CBBC)(R 0 )I][BF 4 ] (R F = CF 3 , (CF 3 ) 2 CF) are located at 20-30 ppm and 92-101 ppm, respectively (cf.…”