131073-65-9Relevant academic research and scientific papers
Diaryldiacyloxyspirosulfuranes. Part 4. A Kinetic Study on the Mechanism of Hydrolysis
Vass, Elemer,Ruff, Ferenc,Kapovits, Istvan,Rabai, Jozsef,Szabo, Denes
, p. 855 - 859 (2007/10/02)
Kinetics of the hydrolysis of diaryldiacyloxyspirosulfuranes leading to sulfoxides have been studied under pseudo-first-order conditions in dioxane-water mixtures.It has been found that high solvent polarities and ionic strengths increase the reaction rate.The reaction is also promoted by electron-donating substituents (ρ -0.52).Strong acids have a catalytic effect on the reaction in which case the substituent effect is more pronounced (ρ -1.55).In neutral medium the deuterium solvent isotope effect is kH2O/kD2O 1.66, while in acidic medium the ratio of catalytic constants is found to be 0.56.The rate of the reaction is greatly increased with the increasing size of the spiroring (from 5 to 7) in the sulfurane.Kinetic data suggest a dissociative reaction mechanism.
Phenyltrimethylammonium Tribromide for Selective Oxidation of Sulfides to Sulfoxides. A Convenient Synthesis of Sulfinyl-18O-Labelled Sulfoxide Carboxylic Acids
Rabai, Jozsef,Kapovits, Istvan,Tanacs, Bela,Tamas, Jozsef
, p. 847 - 849 (2007/10/02)
Various sulfides can be oxidized selectively to the corresponding sulfoxides in high yields using phenyltrimethylammonium tribromide in aqueous pyridine solution.This method allows 18O-labelled sulfoxides to be prepared with no loss of isotope
