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The following exercises are designed to help you become familiar with predicting the 1H NMR spectra of simple organic molecules. For each example you should find the number of signals you expect, where they should show on the scale (chemical shift), and what shape they should be (splitting patterns).
This format shows all four pieces of data that can be inferred from a spectrum (# peaks, shift, integration, multiplicity). Then in the final column, there is a place for you to show a partial structure derived from the data presented.
Numclear magnetic resonance (NMR) is particularly useful in the identification of the positions of hydrogen atoms (1H) in molecules. This is an invaluable technique in the identification of organic compounds and commonly used in analytical laboratories.
NMR spectroscopy (most often 13C and 1H, other nuclei as well) is the most powerful tool for identifying organic molecules. This is due to its sensitivity. Each unique carbon or hydrogen will give rise to a specific signal (peak), with a characteristic chemical shift (position) in the NMR spectrum*.
Overview of typical 1H NMR shifts. Note: alkene region modified from earlier handout.
Distinguish Isomers using COSY. The 1 H NMR Spectrum of Compound A (C 10 H 10 O 2) is below. The singlet at 3.8 ppm is ____________. The position of the aldehydic H at _______ ppm can easily allow for the assignment of the peaks in the H atoms on the double bond in the straight chain.
A GUIDE TO 1H NMR CHEMICAL SHIFT VALUES. Nuclear Magnetic Resonance (NMR) is a commonly used technique for organic compound structure determination. In 1H NMR, applying an external magnetic field causes the nuclei spin to flip.
