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PROTON NMR SPECTROSCOPY

271H NMR SPECTROSCOPY (#1c) The technique of 1H NMR SPECTROSCOPY is central to organic chemistry and other fields involving analysis of organic chemicals, such as forensics and environmental science. It is based on the same principle as magnetic resonance imaging (MRI). This laboratory exercise reviews the principles of interpreting 1H NMR spectra that you should be learning right now in Chemistry 302. There are four questions you should ask when you are trying to interpret an NMR spectrum. Each of these will be discussed in detail. The Four Questions to Ask While Interpreting Spectra 1. How many different environments are there? The number of peaks or resonances (signals) in the spectrum indicates the number of nonequivalent protons in a molecule.

that is bonded to the Cl. Splitting of peaks into more than one line is observed between nonequivalent protons (different chemical shifts) separated by three or less bonds. In some systems, 4 and 5 bond couplings are 7.5 7.0 6.5 6.0 5.5 5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0.0 -0.5 -1.0 2.00 1.98 2.92

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