69119-90-0Relevant academic research and scientific papers
One-electron reduction of methanesulfonyl chloride. The fate of MeSO 2CI?- and MeSO2? intermediates in oxygenated solutions and their role in the cis-trans isomerization of mono-unsaturated fatty acids
Tamba, Maurizio,Dajka, Katalin,Ferreri, Carla,Asmus, Klaus-Dieter,Chatgilialoglu, Chryssostomos
, p. 8716 - 8723 (2008/02/13)
The one-electron reduction of methanesulfonyl chloride (MeSO2Cl) leads, in the first instance, to an electron adduct MeSO2Cl ?- which lives long enough for direct detection and decays into sulfonyl radicals MeSO2? and Cl-, with k = 1.5 × 106 s-1. Both, MeSO2Cl ?- and MeSO2? showed a similar absorption in the UV with λmax of 320 nm. In the presence of oxygen, MeSO 2Cl?- transfers an electron to O2 and establishes an equilibrium with superoxide. The rate constant for the forward reaction was measured to 4.1 × 109 M-1 s -1, while for the back reaction only an interval of 1.7 × 105 to 1.7 × 106 M-1 s-1 could be estimated, with a somewhat higher degree of confidence for the lower value. This corresponds to an equilibrium constant in the range of 2.4 × 10 3 to 2.4 × 104. With reference to E°(O 2/O2?-) = -155 mV, the redox potential of the sulfonyl chloride couple, E°(MeSO2Cl/MeSO2Cl ?-), thus results between being equal to -355 and -414 mV (vs NHE). MeSO2Cl?- reduces (besides O2) 4-nitroacetophenone. The underlying electron transfer took place with k = 1.5 × 109 M-1 s-1, corroborating an E° for the sulfonyl chloride couple significantly exceeding the above listed lower value. The MeSO2? radical added to oxygen with a rate constant of 1.1 × 109 M-1 s-1. Re-dissociation of O2 from MeSO2OO? occurred only very slowly, if at all, that is, with k ? 105 s-1. MeSO 2? radicals can act as the catalyst for the cis-trans isomerization of several Z- and E-mono-unsaturated fatty acid methyl esters in homogeneous solution. The effectiveness of the isomerization processes has been addressed, and in the presence of oxygen the isomerization is completely suppressed.
Novel galactolipids from the leaves of Ipomoea batatas L.: Characterization by liquid chromatography coupled with electrospray ionization-quadrupole time-of-flight tandem mass spectrometry
Napolitano, Assunta,Carbone, Virginia,Saggese, Paola,Takagaki, Kinya,Pizza, Cosimo
experimental part, p. 10289 - 10297 (2009/10/02)
Sixteen novel and ten known galactolipids have been isolated and characterized from the leaves of Ipomoea batatas L. (sweet potato) using an analytical method based on high-performance liquid chromatography coupled with electrospray ionization-quadrupole
