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04 - NMR 3 - Last time Chemical shift(1H and 13C We can...

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1 Last time: Chemical shift ( 1 H and 13 C) We can make a reasonable prediction of chemical shifts for different types of protons and 13 C nuclei. We can also arrive at fairly decent estimates of these shifts from empirical calculations. In simple cases, we will use our general knowledge (use of charts is allowed) to come up with the correct structure; if we have two or more possible structures, then the calculation route may eliminate one (or several) possible structures. You should be reading chapters 1, 3, and 4 (today and Thursday). Work on problems 3.8 (A, C, D, and E) for the next class. We will solve these problems in class. After chapter 4, we will cover IR and MS next.
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2 Conventions 3 J AX 3 refers to the number of bonds AX refers to the nuclei involved (could be 1-2, e.g.) J is given in Hz and is independent of the applied field (unlike the chemical shift in Hz but like the chemical shift in ppm) Two bond coupling is called geminal Three bond coupling is vicinal Scalar (spin-spin) coupling First order interactions: the n+1 rule 2nI+1 for spins other than 1/2
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