“…133 Among other new phosphines prepared as potential ligands for metal-catalysed reactions is the watersoluble triarylphosphine (95), 134 highly fluorous bidentate phosphines (96) 135 and (97), 136 tunable 2,2 0 -biphenylenediphosphines, e.g., (98) 137 and (99), 138 diphospholane-based chiral diphosphine mononoxide ligands, e.g., (100), 139 2,2 0 -bis(dialkylphosphinomethyl)biphenyls, 140 the chiral heterocyclic ligands (101), 141 and a series of chiral bis(diarylphosphino) ethanes bearing one phenyl and one substituted-o-anisyl group at each phosphorus. 142 Several groups have reported the synthesis of b-phosphinoethylboranes by hydroboration of diphenylvinylphosphine. [143][144][145] Heating a 3-(o-diphenylphosphinophenyl)pyrazole derivative with potassium borohydride to 220 1C resulted in the formation of the tris(phosphinoarylpyrazolyl)borate ligand (102), isolated in 64% yield.…”