摘要: H2SO4 mixed with silica gel (1:2) by weight produces a white powder which is an effective catalyst for the oxidation of thioethers to their corresponding sulfoxide by Mn02 under solvent-free conditions.DOI: 10.1080/00397919908086128 年份: 1999 ...
13、测组分定量的氧化或还原;反应具有一定的选择性;反应具有一定的选择性;过量的试剂易于除去(过量的试剂易于除去(a.,如,如H2O2、 (NH4)2S2O8;b.,如,如NaBiO3不不溶于水;溶于水;c.,如过量,如过量SnCl2加加入入HgCl2除去)除去)18l常用的氧化剂:常用的氧化剂: (NH4)2S2O8、KMnO4、 H2O2、HClO4、KIO4、Na...
Kinetics of oxidation of alpha-amino acids, glycine, valine, alanine, and phenylatanine, by sodium N-chloro-p-toluenesulfonamide or chloramine-T (CAT) has been investigated in HClO4 medium at 30degreesC. The rate shows first-order dependence on both CAT and amino acid concentrations and an ...
The rate had inverse fractional and inverse first-order dependence in [H+] with BAT and DCT respectively over the entire [HClO4] range (0.01–0.2 mol dm–3). Addition of the reduced product of the oxidants (toluene-p-sulphonamide) had no significant effect on the rate with all the ...
Na is +1 and Cl is –1 for a total of zero. 2. The sum of all oxidation numbers in a polyatomic ion must be equal to the charge of the ion. - For example: What is the charge on the sulfur in the polyatomic ion SO 4 -2 ? Each oxygen carries an oxidation number of –2, fo...
NBPHÞþ HOBR þ Hþ ðH2OBrÞþ ð4Þ ð5Þ ð6Þ ð7Þ When (H2OBr)+ was taken as reactive species, the rate law obtained showed first-order kinetics with respect to hydrogen ion concentrations, contrary to our observed negative frac- tional order in [HClO4]...
The increase in the CL intensity in the course of a phase transition is associated with the appearance in a multicomponent frozen system of a juvenile surface of H2SO4 crystal hydrates. The lack of CL at T < 220 K in HClO4 solutions is associated with the fact that heating of the ...
活性氧物种主要包括激发态氧分子(单线态氧1O2),含氧自由基(超氧阴离子自由基O2·-、羟自由基·OH、氢过氧自由基HO2·),过氧化物(过氧化氢H2O2、过氧化脂质ROOH)以及含氮氧化物(NO、ONOOH、ONOO-)。通常情况下氧分子处于基态三重态,其电子排布为2s2s2pz2px2py[KK(???)2(???)2(?)2(?)2(?)2(?
Processes of chloride oxidation in these conditions are the same as the chemical reactions in the system O3 –OH – Cl−(aq). Despite its importance in the environment and for ozone-based water treatment, this reaction system has not been previously investigated in the bulk solution. The ...
The relative rates of oxidation of [PtCl4]2 with NaClO3 and H2O2 in 1 mol L1 HClO4 at 50°C are comparable, while that with NaBrO3 is significantly higher. Our 195Pt NMR results confirm previous work on the oxidation of [PtCl4]2 with H2O2 in water, which results in mainly trans-[...