共查询到18条相似文献,搜索用时 140 毫秒
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The 1H and 13C NMR spectra of sugar (5-methyl [1, 2, 4]-triazino [5, 6-b] indol-3-yl) hydrazones (1), per-0-acetyl aldehydo sugar 1-acetyl-1-(5-methyl [1, 2, 4] triazino [5, 6-b]-indol-3-yl) hydrazones (2), l- (penta-0-acetyl-pentitol-1-yl)-10-methyl [l, 2, 4] triazolo [3′, 4′:3, 4] [l, 2, 4] triazino [5, 6-b]-indoles (3) have been investigated. The 2 D NMR (H, C COSY) spectrum of 2a has been studied. 相似文献
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对3′″-羰基-2″-β-L-奎诺糖基淫羊藿次苷Ⅱ(3′″-carbonyl-2″-β-L-quinovosyl icariside Ⅱ),进行了1H和13C MNR检测,参考2″-O-鼠李糖基淫羊藿次苷Ⅱ (2″-O-rhamnosyl icarisid Ⅱ)、淫羊藿次苷Ⅱ(icarisid Ⅱ)和淫羊藿苷(icariin)的1H、13C NMR数据,通过DEPT和1H-1H COSY、HSQC、HMBC等2D NMR技术对该化合物所有的1H和13C NMR信号进行了全归属和详细解析. 相似文献
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13C NMR and 2D (H,H and H,C COSY) spectra of selected examples of sugar (5H-1,2,4-triazino[5,6-b]-indol-3-yl) hydrazones, peracetylated sugar-1-acetyl -1- (5-acetyl-1,2,4-triazino[5,6-b]indol-3-yl)hydrazones, and 10-acetyl-3-(per-0-acetylalditol-1-yl)-1,2,4-triazolo[4′, 3′:2,3][1,2,4]triazino[5,6-b]indole have been reported. The conformation of the latter C-nucleoside analogues have been determined by analysis of their 1H NMR spectra. The D-galacto, D-manno and L-arabino isomers are preponderantly existing in the planar zigzag arrangement of carbon atoms. 相似文献
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应用2D NMR技术研究羌活苷的结构 总被引:7,自引:0,他引:7
从传统中药羌活中分离得到1个香豆素类化合物,应用1D和脉冲梯度场反相2D NMR检测技术 (gCOSY, gNOESY, gHMQC, gHMBC) 研究了其结构,鉴定为6′-O-(反式阿魏酰基)-紫花前胡苷,命名为羌活苷(Forbesoside). 本文对其碳氢NMR信号进行了全归属. 对从伞形花内酯衍生化为7-去甲基软木花椒素、紫花前胡苷元和6′-O-(反式阿魏酰基)-紫花前胡苷的NMR信号变化规律以及糖残基NMR信号归属方法进行了讨论和总结. 相似文献
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《光谱学快报》2013,46(3):267-277
The bridged ruthenium cluster-polypyridine dimer [Ru3O(CH3COO)6(py)2(tmbpy)Ru(bpy)2(Cl)](PF6)2 (py = pyridine, = 2, 2′-bipyridine and tmbpy = 4, 4′-trimethylenedipyridine) has been synthesized and structurally characterized based on 1H and 13C NMR spectroscopy. This species exhibits a complex pattern of NMR signals due to the presence of a paramagnetic [Ru3O] core and seven non-equivalent aromatic rings. 2D NMR (COSY, HMQC and HMBC) correlation techniques have been required for the total assignment of the 1H and 13C NMR spectra. 相似文献
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维库溴胺合成中的6个中间体均为雄甾类化合物,我们以重要中间体2β,16β-二(1-哌啶基)-5α-雄甾烷-3α, 17β-二醇为例,使用质谱、红外光谱和核磁共振技术确定了它的结构,并结合1H NMR, 13C NMR, DEPT, 1H-1H COSY, HSQC, HMBC多种核磁共振分析方法,详细归属了其所有的1H NMR和13C NMR数据,利用ROESY确定了其相对构型. 根据相同方法,归属了其它5个中间体的13C NMR数据,为它们的结构鉴定提供了重要依据,为维库溴铵合成工艺的中间体质量控制提供了参考数据. 相似文献
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