Lecture 6 with ink

Lecture 6 with ink - Lecture 6 NMR Spectroscopy Liquid...

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Unformatted text preview: Lecture 6 NMR Spectroscopy Liquid Chromatography Experiment 6: Reduction with NaBH 4 So what does NMR tell us?? Number of protons on the molecule What kind of atoms the protons are attached to The number of adjacent protons This is an extremely powerful tool!!! Symmetry If there is a plane of symmetry, the mirrored nuclei appear at identical chemical shift (invisible) If identical branching, they show up the same So how do you explain the position of alkene aromatic, or aldehyde protons? Anisotropy- orbitals do not have spherical cloud orbital creates mag field perpendicular to 1H axis Abundance in nature is only 1.1% Need more sensitive instrumentation to detect Splitting patterns and integration not reliable Likelihood of having an adjacent 13C nuclei is low Coupling and splitting have been removed from 13C NMR 13C signal = 20 times the 1H equivalent Identify the splitting and integration of the following molecule in 1 H NMR: Identify the splitting and integration of the following molecule in 1 H NMR: Circle the nuclei that can be detected using NMR The following spectrum belongs to which compound? The following spectrum belongs to which compound?...
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Lecture 6 with ink - Lecture 6 NMR Spectroscopy Liquid...

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