Fragmentation of pyrazolecarbaldehyde thio- and dithioacetals under electron impact and chemical ionization |
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Authors: | L V Klyba L K Papernaya E R Sanzheeva A A Shatrova E V Rudyakova G G Levkovskaya |
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Institution: | 1.Favorskii Irkutsk Institute of Chemistry, Siberian Division,Russian Academy of Sciences,Irkutsk,Russia |
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Abstract: | The mass spectra of 1-substituted 3,5-dimethyl-1H-pyrazole-4-carbaldehyde bis(2-hydroxyethyl) dithioacetals and thioacetals were studied for the first time. The main fragmentation
pathways of their molecular ions generated under electron impact and chemical ionization were similar. Primary decomposition
of the molecular ions of bis(2-hydroxyethyl) dithioacetals involves elimination of 2-sulfanylethanol molecule with formation
of the corresponding 1,3-oxathiolane radical cation. Fragmentation of the molecular ions M]+ · and M + H]+ derived from 2-(3,5-dimethyl-1H-pyrazol-4-yl)-1,4,6-oxadithiocanes includes cleavage of the eight-membered heteroring and elimination of C4H9OS ·. Substituents in the heteroring of pyrazolecarbaldehydes inhibit decomposition processes related to the aldehyde group. |
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