CH 221 Edition 7 Lecture 35 Outline of Last Lecture I. NMR Spectroscopy II. Diamagnetic ShieldingIII. Proton NMR SpectrumOutline of Current LectureIV. More on NMR SpectroscopyV. Diamagnetic AnisotropyVI. SplittingCurrent LectureIV. More on NMR Spectroscopy - The closer the electronegative the atom (or group) the more it deshields the proton- Higher frequency methine > methylene > methyl lower frequency- Chemical shift of protons attached to sp2 carbon appear at higher frequencies than one would predictV. Diamagnetic Anisotropy (Benzene ring protons)- Protons show signals at higher frequencies because they sense the larger effective magnetic field- Integration identifies relative number of protons- Area under each signal is proportional to number of protons giving rise to the signalVI. Splitting (N+1)- Occurs when different kinds of protons are close enough for their magnetic fields to influence one another = spin-spin coupling- N is the number of equivalent protons on adjacent carbons that are not equivalent to the protons that produce the signalThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a
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