这四个氢化学位移都相同,其中同碳亚甲基的一组氢是可以通过镜面对称操作互换的对映氢,它们在非手性环境中是化学等价的,在手性环境中是化学不等价的;异碳的一组氢是可以通过C2旋转轴操作互换的同位氢,它们在任何环境中都是化学等价的。这样四个化学位移相同的氢,尽管存在耦合作用,但是却不产生裂分峰,所以1HNMR表...
The new structures have been elucidated by two-dimensional NMR-techniques and chemical synthesis. In contrast to previous publications, pellepiphyllin has been found as a constituent of P. epiphylla . 1997 Elsevier Science Ltd. All rights reserved...
摘要: A new bibenzyl together with four known compounds were isolated from the medicinal plant Dendrobium huoshanense. The chemical structures of all the compounds were determined by spectroscopic methods, including 1D and 2D NMR, as well as HR-ESI-MS.关键词: Dendrobium huoshanense bibenzyl ...
Our study revealed nine structurally distinct bisbibenzyls (1 –9 ), identified based on 1D and 2D NMR, IR, UV and HRESIMS data. Among them were five previously undescribed compounds (2 –6 ). The remaining compounds found and previously described in the literature were: the bisbibenzyls ...
Provied information about meso-α,α'-Dimethyl-4,4'-dichlor-bibenzyl(Molecular Formula: C16H16Cl2, CAS Registry Number:64985-93-9 ) ,Boiling Point,Melting Point,Flash Point,Density, Molecular Structure,Risk Codes,Synthesis Route at guidechem
13CNMR IR1 IR2 Mass MS-NW-9577 o-phenethylbenzoic acid C15H14O2 (Mass of molecular ion: 226) Source Temperature: 180 °C Sample Temperature: 150 °C Direct, 75 eV 18.0 1.9 39.0 1.7 51.0 1.7 63.0 1.4 65.0 6.8 76.0 1.1 77.0 5.3 79.0 2.8 89.0 2.8 90.0 1.3 91.0 100.0 92.0 8.5...
4-(2-Hydroxyphenethyl)-2,6-dimethoxyphenol, a bibenzyl, was isolated from the leaves of Empetrum nigrum var. japonicum , collected from Mount Tateyama. Japanese rock ptarmigans frequently eat the leaves and fruits of this plant. The structure of the bibenzyl was confirmed by NMR spectroscopic ...
关键词: 1D and 2D NMR Pellia endiviifolia human glioblastoma cell line human leukemia cell lines human teratocarcinoma cell line perrottetin E derivatives DOI: 10.3390/plants10061063 年份: 2021 收藏 引用 批量引用 报错 分享 全部来源 求助全文 EBSCO NCBI ResearchGate www.mdpi.com 相似文献...
Eight bibenzyl derivatives, namely dendrocandins J–Q (1–8), were isolated from the stems of Dendrobium candidum. Their structures were elucidated by 1D and 2D NMR experiments and mass spectrometry. Compounds 1–8 were examined for antioxidant activity by 1,1-diphenyl-2-picrylhydrazyl free radic...
958791-92-9 Basic Information Chemical Name2-[[3-(4-methylpiperidino)-2-(3-carboxypropoxy)]propoxy]bibenzyl CAS No.958791-92-9 Molecular FormulaC27H37NO4 Molecular Weight439.58700 PSA59.00000 LogP4.77040 View More958791-92-9 Properties