Mass spectrometric study on methyl 5-methyl-2-oxo-3-[2-(4-R-phenyl)-1-ethyl]cyclopentanecarboxylates and methyl 2-oxo-5-(4-R-phenyl)-3-propylcyclopentanecarboxylates
- He, XR
- Chen, B
- Wang, JB
- He, MY
DOIAbstract
The mechanisms of mass spectrometric fragmentation of eight new compounds, including methyl 5-methyl-2-oxo-3-[2-(4-R-phenyl)-1-ethyl]cyclopentanecarboxylates (Group I, R=substitueut) and methyl 2-oxo-5-(4-R-phenyl)-3-propylcyclopentanecarboxylates (Group II, R=substituent), were studied using mass analyzed ion kinetic energy spectrometry. The chemical compositions of these compounds and some of their important fragment ions were verified by high-resolution MS data, There were two types of H-rearrangement as regards the route of fission. In one type, the gamma-H migration was influenced by both the electron effect and the steric hindrance of substituents, whereas on the other alpha-H migration losing methanol was due to the alpha-position ac...
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