The structures of representative bicyclic peptides are confirmed through the NMR methods of HMBC and HMQC-TOCSY. Complete assignment of proton and carbon resonances is afforded by these two-dimensional NMR methods. HMQC-TOCSY is especially useful for assigning spectra in molecules having extensive ...
The structures of poly(allyl alcohol) were characterized by one- and two-dimensional gradient-enhanced heteronuclear multiple quantum coherence (gHMQC) and gradient-enhanced heteronuclear multiple-bond connectivity (gHMBC) NMR spectroscopy. Main-chain structures and chain-end structures were identified from...
百度试题 题目普通的13C-NMR包括 A.DEPT谱B.噪音去偶谱C.NOESY谱D.HMBC谱E.HMQC谱 相关知识点: 试题来源: 解析 A,B 反馈 收藏
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HMQC 全称:Heteronuclear Multiple Quantum Correlation/coherence 类型:2D 相关核:任何两种不同的NMR活性核,尽管通常是1H和13C或15N 作用:相关两个直接结合的不同核的化学位移 目的:识别由于检测敏感核而具有更大灵敏度的1键异核直通耦合,尽管观察到的信号倾向于较宽,因为它测量多重量子相干性 ...
6:解析13C-1HCOSY(或HMQC、HSQC)谱,同样从已知的氢谱线出发我到各相关的碳谱线,以此推断出这些碳谱线的归属。 7:解析13C-1H远程相关谱(COLOC或HMBC),从已确定的碳谱线出发,找到与之相关的各氢谱线或从已知的氢谱线出发找到各相关的碳谱线,由此完成对一些未知谱线的指认。在二维谱中由于一些相关峰的强度较弱...
百度试题 题目化合物I和II是一对差向异构体(*只有一个手型C原子的构型不同),利用哪种谱图,可以有效区分它们: A. 1H-NMR B. HMBC C. HMQC D. NOE差谱 E. 1H-1H COSY F. 相关知识点: 试题来源: 解析 A.1H-NMR 反馈 收藏
The 1 H and 13 C NMR spectra of 13 2 ( R )-methoxychlorophyll a were assigned utilizing the two-dimensional 1 H-detected heteronuclear one-bond (HMQC) and multiple-bond (HMBC) correlation techniques. The protons and carbons of the macrocycle and its short side-chains could be completely ...