核磁共振解析2.ppt
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1、2D NMR 图谱,结构鉴定: 化合物2-1,H-21a,H-21b,H-4,H-3,Me-23,Me-20,1H NMR of 2-1,H-2,C-1,C-22,C-9,C-10,C-4,C-21,C-3,C-19,C-20,13C NMR of 2-1,C-2,H-4,H-3,H-2,Me-20,H-18,H-15,H-14,H-13a,H-16a,H-17a,H-6,H-7a,1H,1H-COSY,H-11a,H-12a,HMBC (高场区),C-3,C-7,H-19a,H-3,C-2,C-18,Me-20,C-19,H-21a,H-21b,C-8,C-6,C-5,H-4,检测的是核与核
2、之间的关系,Direct H-C correlations (HSQC) Interaction between H and C atoms through one bond.,1JC-H correlations,C-1,H-1,Spectrum 13C,1H Spectrum,1H-1H correlations (COSY) Proton interaction trough three bonds.,3JH-H correlations,H-1,H-2,Spectrum 1,Spectrum 1,适用于重叠峰耦合的判断,Long-range 13C-1H correlations (H
3、MBC). Interaction between 13 and 1 nuclei trough two and three bonds.,HMBC peaks corresponding to 2- and 3-bonds correlations are undistinguishable!,-1,H-i H-k,Spectrum 13,Spectrum 1,Nuclear Overhauser Effect (NOE),Interaction between 1H-1 and 1H-2 when they are distanced in the space by r 5 . NOE p
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