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本文从~(13)C—NMR谱化学位移证实烷基吸电子诱导效应的存在,并阐明烷基的超共轭效应对体系的推电子作用.
In this paper, the chemical shift of ~ (13) C-NMR spectra was used to confirm the existence of alkyl-induced electron-inducing effect and to elucidate the electron-pushing effect of alkyl superconjugation on the system.