Lithium Tetra(pentafluorophenyl)borate

[2797-28-6] C24BF20Li (MW 685.98) InChI = 1S/C24BF20.Li/c26-5-1(6(27)14(35)21(42)13(5)34)25(2-7(28)15(36)22(43)16(37)8(2)29,3-9(30)17(38)23(44)18(39)10(3)31)4-11(32)19(40)24(45)20(41)12(4)33;/q-1;+1 InChIKey = WTTFKRRTEAPVBI-UHFFFAOYSA-N (reagent especially used for generating “free” acid catalysts with a noncoordinating (C6F5)4B− ligand) Alternative Name: lithium tetrakis(pentafluorophenyl)borate. Physical Data: mp 120–124 °C (measured for diethylether complex, LiB(C6F5)4·2.5(Et2O)). Solubility: soluble in diethyl ether, MeOH, and H2O. Form Supplied in: commercially available as a diethyl ether complex (white powder). Analysis of Reagent Purity: IR, elemental analysis. Preparative Methods and Purification: LiB(C6F5)4 (1) is prepared by the reaction of tris(pentafluorophenyl)borane [B(C6F5)3] with lithium pentafluorobenzene (LiC6F5) in pentane at −78 °C.1,2 Filtration of the white precipitate provides the salt 1 (white powder) sufficiently pure for elemental analysis. LiC6F5 is prepared from bromopentafluorobenzene (BrC6F5) and n-BuLi in pentane. Handling, Storage, and Precautions: should be stored in a dry, dark, and cold place. Not to be exposed to oxidants, acids, and bases.