2023年1月30日 · Taking a close look at three 13 C NMR spectra below. The 13 C NMR spectrum for ethanol. The NMR spectra on this page have been produced from graphs taken from the Spectral Data Base System for Organic Compounds (SDBS) at the National Institute of Materials and Chemical Research in Japan.

2019年4月1日 · A convenient one-dimensional magic-angle spinning NMR method is presented that provides selective NMR spectra of COH moieties in uniformly 13 C-enriched organic materials.

A convenient one-dimensional magic-angle spinning NMR method is presented that provides selective NMR spectra of COH moieties in uniformly 13 C-enriched organic materials. This method, termed hydroxyl-proton selection (HOPS), eliminates the magnetization of protons directly bonded to carbo …

2021年9月21日 · 有机化学或分析化学中我们都会学习解谱，此技巧至关重要！在科研中，谱图确认作为一种基础基本技能。 合成工作者、科研者珍藏！ 一、hnmr化学位移 二、活泼氢化学位移（注意溶剂：cdcl3） 三、cnmr化学位移 解谱中…

As you can see from the diagram above there are 2 different chemical shift lines in the C-13 NMR spectrum of 2-methylpropan-2-ol indicating 2 different chemical environments of the 4 carbon atoms of 2-methylpropan-2-ol. (Note the 2 different colours indicating the 2 different chemical environments of the 4 carbon atoms in 2-methylpropan-2-ol).

Carbon-13 (C13) nuclear magnetic resonance (most commonly known as carbon-13 NMR spectroscopy or 13 C NMR spectroscopy or sometimes simply referred to as carbon NMR) is the application of nuclear magnetic resonance (NMR) spectroscopy to carbon. It is analogous to proton NMR (1 H

2017年12月13日 · 13C NMR spectroscopic studies were performed for carbonyl compounds having a hydroxyl group, a carboalkoxy group, an acetoxy group, or a carboxyl group in various solvents with different polarities for observation of their behaviors of 13 C NMR chemical shifts of carbonyl carbons in solutions.

This page takes an introductory look at how you can get useful information from a 13 C NMR spectrum. Important: If you have come straight to this page via a search engine, you should be aware that this is the second of two pages about 13 C NMR.

2011年6月23日 · 常规13CNMR谱为全去偶谱，所有的碳均为单峰。 •灵敏度低。 H信号弱得多，约1/6400。 C核的数目。 （2）采用共振技术，利用NOE效应增强信号强度。 （3）多次扫描累加，是最常用的有效方法。 （4）改变仪器测量条件。 谱图复杂。 常采用一些特殊的测定方法。 C的偶合全部去掉。 NOE增强：峰强度增强。 简化了图谱：每种碳原子都出一个单峰，互不重叠。 无法识别伯、仲、叔、季不同类型的碳。 •峰的裂分数目不变，裂距减小。 项系数比。 CNMR …

2023年1月30日 · This page describes what a C-13 NMR spectrum is and how it tells you useful things about the carbon atoms in organic molecules. About 1% of all carbon atoms are the C-13 isotope; the rest (apart from tiny amounts of the radioactive C-14) is C-12. C-13 NMR relies on the magnetic properties of the C-13 nuclei.