Electric Literature of 4062-60-6, Catalysts are substances that increase the reaction rate of a chemical reaction without being consumed in the process. 4062-60-6, Name is N1,N2-Di-tert-butylethane-1,2-diamine, molecular formula is C10H24N2. In a Article，once mentioned of 4062-60-6
The equilibrium acidities (pK(a)s) of six families of remotely substituted benzyl onium salts (i.e., 4-G-C6H4CH2-E+·Br-, where E+ = Ph3P+, Ph2PO, Et3N+, Me2S+, Me2Se+, and Bu2Te+ and G = H, Me, CF3, CO2Me, CN, and NO2), one family of alpha-E+ substituted acetophenones (i.e., PhCOCH2-E-·Br-, where E+ = Me2S+, Bu2Te+, Bu3P+, and Ph3As+), and one family of 9-E+-substituted fluorenes (i.e., 9-E+- FlH·Br-, where E+ = Bu2S+, Me2Se+, Bu2Te+, Bu3P+, and Ph3As+) have been determined in a single solvent, dimethyl sulfoxide (DMSO). This allowed meaningful comparisons of the thermodynamic stabilities for an extensive range of Group VB and VIB ylides covering up to six elements (N, P, As; S, Se, Te) to be made for the first time on the basis of a unified standard. A comparison of the pK(a) values of onium salts with those of their parents shows that all the onium substituents studied in the present work are strongly ylide-stabilizing, covering an anion stabilization energy range of 17-35 kcal/mol (i.e., DeltapK = 12-25 pK units). A further examination of the pK(a) values also reveals that the thermodynamic stabilities of the Group VB onium ylides are in a decreasing order of P+-C- > As+-C- > N+-C- and of the Group VIB onium ylides in a decreasing order of S+-C- > Se+-C- ~ Te+-C-, if the substituents on the onium atoms are kept similar. The stability order for the ylides of the third-row elements was found to be S+- C- > P+-C-, as implied by the DeltapKs of 1.7-4.2 for the three R3P+-C- /R2S+-C- pairs compared (see text). The pK(a)s of the eight remotely substituted E+-CH2Ar series all correlate well with the sigma- constants (see Table 3) with a decreasing order of slopes as (E+ =) Ph2P(O) (-5.86) > Ph3As+ (-5.35) > Bu3P+ (-5.00) > Ph3P+(-4.46) and Bu2Te+ (-5.50) > Me2Se+ (-5.03) > Me2S+ (-3.40), suggesting a similar trend for the extent of charge localization at the carbanions next to the E+ group. All these observations are consistent with the assumption that at least part of the gained stabilization in the phosphonium and sulfonium ylide cases (especially the latter) has to be attributed to the backbonding stabilization involving the sigma* and/or 3d orbital participation. Discussion for elucidating this view is presented.
Sometimes chemists are able to propose two or more mechanisms that are consistent with the available data. Electric Literature of 4062-60-6, If a proposed mechanism predicts the wrong experimental rate law, however, the mechanism must be incorrect.Welcome to check out more blogs about 4062-60-6, in my other articles.
Reference：
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI