(1)麦氏重排(Mclafferty rearrangement) 分子离子或碎片离子结构中有双键,且在γ位上有H原子的正离子都能发生麦氏重排。在开裂中,γ位上的H通过六元环过渡态的迁移到电离的双键碳或杂原子上,同时烯丙键断裂,生成中性分子和碎片离子。 醛、酮、羧酸、酯、酰胺、碳酸酯、磷酸酯、肟、腙、烯、炔以及烷基苯等的含...
1 H NMR spectra of porphyrin dianionsNot Availabledoi:10.1007/BF00615444G. N. SinyakovA. M. Shul'gaG. P. GurinovichKluwer Academic Publishers-Plenum PublishersJournal of Applied Spectroscopy
求翻译:1 H-NMR spectra were recorded using 500 and 400 MHz in CDCl 3 solutions at room temperature (TMS was used as an internal standard) on a Bruker, Avance 500 instrument (Rheinstetten, Germany) and Varian 400 NMR. FT-IR spectra were recorded on a spectrophotometer (Jasco-680, Japan)...
1 H NMR Spectra of Trimethyltin Chloride Partially Oriented in a Nematic PhaseNot Availabledoi:10.1016/0022-2364(80)90215-2Hideaki FujiwaraKensuke TakahashiYoshio SasakiElsevier Inc.Journal of Magnetic Resonance (1969)
high‐resolution 1H NMRbrainIt is shown that high-resolution (1)H NMR spectra of intact excised tissues and organs can be obtained by rotating the sample slowly about an axis at the magic angle of 54 degrees 44' with the external magnetic field. In this way tissue and cellular damage ...
核磁共振氢谱(1HNuclearMagneticResonanceSpectra,1HNMR)核磁共振氢谱(1HNuclearMagneticR1影响化学位移的因素化学位移自旋耦合与裂分影响化学位移的因素 化学位移自旋耦合与裂分2化学位移电子屏蔽效应核磁共振氢谱图示化学位移化学位移电子屏蔽效应 核磁共振氢谱图示...
n-hexane (6:6 mL)for around 1 h and filtered through the silica gel plug. The solution was concentratedin vacuo. The crude residue was purified by flash chromatography (n-hexane) to obtainthe corresponding bromide as a colorless oil. The 1H NMR spectra were consistent withpreviously reported...
aThe 1H NMR spectra of 9a shown in Figure 4 before and after irradiation and after warming to room temperature are representative of the changes observed in the 180 rotation process in these systems. 在上图显示的9a 1H核磁共振光4在辐照区域前后和在温暖以后对室温是被观察的变化的代表在180...
3.2.显示针对肌肉的石油行动提取的 1H NMR 光谱 翻译结果3复制译文编辑译文朗读译文返回顶部 3.2.1 H 核磁共振光谱显示石油操作上肌肉提取物 翻译结果4复制译文编辑译文朗读译文返回顶部 3.2.*1h核磁共振频谱显示石油操作的肌肉提取 翻译结果5复制译文编辑译文朗读译文返回顶部 3.2. 1H显示对肌肉萃取物的核磁共振光石油...
1、HNMR1核磁共振氢谱Proton Nuclear Magnetic Resonance SpectraHNMR2核磁共振氢谱12学时基本原理,化学位移,自旋-自旋分裂谱图信息与分子结构关系谱图解析,简化谱图及辅助解析方法HNMR3原子核的自旋原子核质量数为双数时,自旋量子数I为整数,为单数时,I为半整数(1/2,3/2,5/2)原子核置于磁场中,核磁有2I+1种取...