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| Conformational Analysis of γ-Butyrolactones by Nuclear Magnetic Resonance Spectroscopy | |
| 摘 要： | Conformationalanalysis[']offive-memberedringsystCms,[2]althoughofintereStbecauseofthewidespreadoccimnceofsuchSystemsinnatUre(incarbohydraes,steroids,alkaloids,nucleicarids,andcertainaminoacids),hasprogressedmuchmoreslowythanthecorresPondinganatysisofthesix-memberedhomologs,l56l:,2M=7ve27X::conformationalmobilityoffive-memberedri.gS.I$Itiscommonlyknownthatafive-memberedringekistSinanonplanarconformationanditSmoststablepuckeredformsaretheenveloPeandhalf-Chairconformations.I41TheenveloPecon… |
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