请教汪老师？ 下面是40个异喹啉生物碱的15 n nmr研究 15 n nmr study of isoquinoline alkaloids abstract 15 n nmr chemical shifts of 40 tertiary and quaternary isoquinoline alkaloids of six constitutional types are reported. the selected compounds belong to the classes of benzo[ c ]phenanthridine, protoberberine, benzylisoquinoline, aporphine, pavinane, and -carboline-proaporphine alkaloids. the 15 n chemical shifts were measured by gradient-enhanced inverse-detected single-quantum (gsqmbc) and multiple-quantum (ghmbc) multiple-bond correlation experiments. the 1 h- 15 n long-range coupling constants determined from the phase-sensitive gsqmbc spectra are also reported in order to facilitate optimization of multiple-bond correlation experiments. 查看更多
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