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In solution, base-catalyzed hydrolysis and transesterification of esters are initiated by hydroxide- or alkoxide-ion attack at the carbonyl carbon. At low pressures in the gas phase, however, transesterification proceeds by an attack of the enolate anion of an acetate ester on an alcohol. Fourier transform mass spectrometry (FTMS) indicates that the reaction is the second-order process: - ...
In solution, base-catalyzed hydrolysis and transesterification of esters are initiated by hydroxide- or alkoxide-ion attack at the carbonyl carbon. At low pressures in the gas phase, however, transesterification proceeds by an attack of the enolate anion of an acetate ester on an alcohol. Fourier transform mass spectrometry (FTMS) indicates that the reaction is the second-order process: - ...
UV irradiation of a T-rich hexadeoxynucleotide, d(TATTAT), produced four photoproducts, which can be cleanly separated from starting material and each other by reverse-phase HPLC. The structures of the photoproducts were investigated by using 1D 1 H-NMR, which allows the nature, but not the location, of the photoproduct between adjoining Ts or between T and A to be determined. Both fast...
The C 5 H 10 adduct ions from the two highly exothermic reactions of propene (C 3 H 6 ) radical cations with neutral ethene (C 2 H 4 ) and cyclopropane radical cation with ethene were isolated and detected by incorporating an r.f.-only-mode event into the FTMS experimental sequence. These adducts, which cannot be observed under the low-pressure...
Various gas-phase C 8 H 10 radical cations were investigated by using tandem mass spectrometry (MS/MS) and by utilizing AM1, PM3 and MNDO semi-empirical computations. The dissociation properties of the radical cations of bicyclo[2.2.2]octa-2,4-diene (dihydrobarrelene, DHB), bicyclo[4.2.0]octa-2,4-diene (BCO), 1,3,5-cyclooctatriene (COT), and 1,3,5,7-octatetraene (OT) were found...
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