Spectroscopy Learning Module, Part 4

Spectroscopy Learning Module, Part 4 - Think of a problem...

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Unformatted text preview: Think of a problem as a puzzle, and approach it with logic Calculate the degrees of unsaturation first Deg. Unsat = [2*C H hal + N +2]/2 Look at IR for functional groups Look at proton NMR for information about neighboring groups ut pieces together to arrive at lution Put pieces together to arrive at solution Check to make sure your structure agrees with your spectra 1 C 6 H 10 O 3 2 Calculate degrees of unsaturation first Deg.Unsat =[2*C H hal +N+2]/2 So for the formula in this problem, C 6 H 10 O 3 , the egree of nsaturation (2*6 +0+2)/2 which degree of unsaturation is (2*6-10-0+0+2)/2, which comes out to be 2 degrees of unsaturation. Recall that a bond or a ring count as a degree of unsaturation. So, we must have Two double bonds, or One double bond and one ring, or Two rings, or One triple bond 3 the IR, we see signals for the C- stretching In the IR, we see signals for the C H stretching and for C=O stretching Note there is no indication of a hydroxyl C-H stretching C=O stretching 4...
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Spectroscopy Learning Module, Part 4 - Think of a problem...

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