Replacement of trimethylamine in trimethylamine-trispentafluoroethyl-borane. Structures of [(C2F5)(3)BNMe3] [NMe4](C2F5)(3)BOH], and K[(C2F5)(3)BCH2(CO)C6H5]

摘要

Trimethylamine-tris(pentafluoroethyl)borane [(C2F5)(3)BNMe3] (1) reacts at 190 degrees C with water under displacement of the trimethylamine ligand to yield the hydroxy-tris(pentafluoroethyl)borate [(C2F5)(3)BOH](-) (2). In tributylamine 1 reacts with alkynes HC CR to form novel ethynyl-tris(pentafluoroethyl)borate anions [(C2F5)(3)BC CRI- - R = C6H5 (3), C6H4CH3 (4), Si(CH(CH3)(2))(3) (5) - in moderate yields. Compound 3 adds water across the triple bond to form the novel anion [(C2F5)(3)BCH2(CO)C6H5](-) (6). The structures of [(C2F5)(3)BNMe3], [NMe4][(C2F5)(3)BOH] and K[(C2F5)(3)BCH2(CO)C6H5]. have been determined by x-ray crystallography.