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. 1608-26-0, Name is Tris(dimethylamino)phosphine
, molecular formula is P[N(CH3)2]3. In a Article£¬once mentioned of 1608-26-0, Quality Control of: Tris(dimethylamino)phosphine
STRUCTURES IN SOLUTION OF ADDUCTS OF HEXAMETHYLPHOSPHORUS TRIAMIDE AND SUBSTITUTED BENZILS
Hexamethylphosphorus triamide has been allowed to react with p,p’-dinitrobenzil, p-chlorobenzyl, p,p’-difluorobenzil, p,p’-dimethylbenzil and p,p’-dimethoxybenzil.All of these materilas in benzene-d6 had negative delta 31P chemical shifts except for the p,p’-dinitro adduct whose resonance was found to delta +17.6.In dichloromethane-d2 the resonances ranged from delta +38.2 for the p,p’-dinitro adduct to delta -22.5 for the p,p’-dimethoxy adduct.The 13C NMR spectra of these compounds all showed coupling JPOCC to the ipso carbons except for the p,p’-dinitro adduct.These data indicate that the p,p’-dinitro adduct is ionizing rapidly and that the others are phosphoranes.On cooling the coupling was lost for the p,p’-difluoro adduct and for the p-chloro adduct.These spectral changes are attributed to rapid ionization which occurs because of the change of the dieletric constant with change in temperature.
Sometimes chemists are able to propose two or more mechanisms that are consistent with the available data.Quality Control of: Tris(dimethylamino)phosphine
, If a proposed mechanism predicts the wrong experimental rate law, however, the mechanism must be incorrect.Welcome to check out more blogs about 1608-26-0, in my other articles.
Reference£º
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