A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 13991-08-7, Name is 1,2-Bis(diphenylphosphino)benzene, molecular formula is C30H24P2. In a Article，once mentioned of 13991-08-7, COA of Formula: C30H24P2
The reactions of (Me2S)BH2Br and (Me2S)BHBr2 with equimolar quantities of l,2-bis(diphenylphosphanyl)ethene (1) or -benzene (2) lead to cyclic, cationic bis(phosphane)boranes {4: [(1)BH2]+ [(1)BH2]; 5: [(l)BHBr]+ [(1)BH2]; 6: [(2)BH2]+ Br-; 7: [(2)BHBr]+ The (1)BH2]+ counterions can be exchanged in metathesis reactions (e.g. with AgBF4 to afford 4a). The tritertiary phosphane bis[2-(diphenylphosphanyl)phenyl]phenylphosphane (3), reacts with (Me2S)BHBr2 to give bicyclic dicationic tris(phosphane)borane 8, [(3)BH]2+-2 Br-, which can be converted into the bis(hexafluorophosphate) 8a using NH4PF6. All compounds have been characterized by analytical and NMR-spectroscopic data. The crystal and molecular structures of 5-7 have been determined by single-crystal Xray diffraction.The five-membered rings C2P2B have an envelope conformation and show no sign of electron delocalization. Attempts to deprotonate the B-H functions in 5-8 have not been successful. Clearly, the two (5-7) or three phosphonium centers (8) adjacent to the boron atom are not sufficient to induce an “umpolung” of the B-H group. WILEY-VCH Verlag GmbH,.
Sometimes chemists are able to propose two or more mechanisms that are consistent with the available data.COA of Formula: C30H24P2, If a proposed mechanism predicts the wrong experimental rate law, however, the mechanism must be incorrect.Welcome to check out more blogs about 13991-08-7, in my other articles.
Reference：
Phosphine ligand,
Chiral phosphine ligands in asymmetric synthesis. Molecular structure and absolute configuration of (1,5-cyclooctadiene)-(2S,3S)-2,3-bis(diphenylphosphino)butanerhodium(I) perchlorate tetrahydrofuran solvate