中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
—— | Methyl-(4-ethoxy-phenyl)-sulfid | 33733-78-7 | C9H12OS | 168.26 |
(4-乙氧基苯基)硫代]乙酸 | (4-ethoxy-phenylsulfanyl)-acetic acid | 51094-45-2 | C10H12O3S | 212.269 |
4-乙氧基苯硫醇 | 4-ethoxy-benzenethiol | 699-09-2 | C8H10OS | 154.233 |
4-氯苯基甲基砜 | 4-chlorophenyl methyl sulfone | 98-57-7 | C7H7ClO2S | 190.65 |
micellar effect % Hammett correlation % Piszkiewicz cooperative model KR nema The influence of cetyltrimethylammonium bromide, CTon the oxidative decarboxylation of phenylsulfinylacetic acid, PSAA and several meta- and para-substituted PSAAs by Cr(VI) was investigated in 95 % H2O-5 % CH3CN medium. The rate profile displayed a peculiar trend with an initial rate increase at low [CTAB] followed by sharp rate inhibition at higher [CTAB]. The initial rate acceleration can be explained by strong binding of SO42- on the positively charged micellar surface. The specific partitioning of PSAA in micellar phase by hydrophobic interaction and the oxidizing species, HCrO3+ in aqueous phase by electrostatic repulsion accounted the rate retardation at higher [CTAB]. The Hammett plot with different substituted PSAAs showed an excellent correlation affording negative ? value which supports the proposed mechanism involving a sulfonium cation intermediate formation. The obtained ? value in CTmedium is found to be slightly lower than that in aqueous medium. The quantitative analysis of rate data for the inhibition shown by CTwas performed using Menger-Portnoy and Piszkiewicz pseudo-phase models. The binding constant for PSAA with micelle was evaluated from Piszkiewicz cooperative model.