Introduction 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. Remember that each peak identifies a carbon atom in a different environment within the molecule ...

13C Carbon NMR. How is it different from 1H NMR and why there is no signal splitting? What is the ppm range and how to determine the number of signals.

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

This section will help identify how to interpret information from 13 C NMR spectra. Starting with the 13 C NMR spectrum for ethanol, C 2 H 6 O. Remember that each peak identifies a carbon atom in a different environment within the molecule. In this case there are two peaks because there are two different environments for the carbons.

For carbon element, the most abundant isotope 12 C (with ~99% natural abundance) does not have a nuclear magnetic moment, and thus is NMR-inactive. The C NMR is therefore based on the 13 C isotope, that accounts for about 1% of carbon atoms in nature and has a magnetic dipole moment just like a proton. The theories we have learned about 1 H NMR spectroscopy also applies to 13 C NMR, however ...

INTERPRETING C-13 NMR SPECTRA? This page takes an introductory look at how you can get useful information from a C-13 NMR spectrum.

在我们对 核磁共振的基本原理以及核磁共振氢谱（蓝色字体为文章链接，点击查看相关文章）有了一定认识后，再去研究核磁共振碳谱，就比较容易了。碳谱所测原子核为13C，其天然丰度只占1.108%，因此相对于1H而言信号…

The 13C NMR signals for carbonyl carbons are generally the furthest downfield (170–220 ppm) due to both sp2 hybridization and the double bond to oxygen. Integration and Coupling in 13C NMR Unlike 1 H NMR, the area under a 13 C NMR signal cannot easily be used to determine the number of carbons to which it corresponds.

By the end of this section, you will be able to: Identify the differences between 1 H NMR and 13 C NMR and their spectra. Identify those carbon atoms which are equivalent (due to symmetry) in a given chemical structure. Predict the approximate chemical shifts of each of the carbons in an organic compound, given its structure and a table of chemical shift correlations.

nmrshiftdb2 is a NMR database (web database) for organic structures and their nuclear magnetic resonance (nmr) spectra. It allows for spectrum prediction (13 C, 1 H and other nuclei) as well as for searching spectra, structures and other properties.