Computer Exercises Set 2

Computer Exercises Set 2 - COMPUTER EXERCISES: Computer...

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COMPUTER EXERCISES: Computer Problem Set 2 The following questions refer to figure “8.36” (carvone). 1. Determine the areas of the four groups of resonances in the spectrum; the resonances appearing in the range of 2.1–2.8 are to be considered as one group. Using the “Landscape” mode, print a copy of the unexpanded spectrum that shows a listing of the integrations. Ignore the peak near 7.3 as it is an impurity. 2. To the nearest 0.01 ppm, provide the chemical shift of each set of protons, writing these values by the corresponding resonances on your printed spectrum. In the case of multiplets, the value should be at the center of the multiplet. 3. Based on chemical shifts, integrations, and multiplicities, assign the resonances associated with the protons labeled “a–d See figure below),” and write these assignments on your printed spectrum by the peak(s) to which they correspond. Provide a justification for each of your assignments. Be certain to specify what electronic factors help you to account for the large difference in the chemical shifts of the two different types of vinylic protons in carvone. ( Hint: Consider what effect electronic delocalization has on the electron density near the vinylic proton on C(3) of the molecule. H
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Computer Exercises Set 2 - COMPUTER EXERCISES: Computer...

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