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Unformatted text preview: NMR Assignment Nucleophilic Substitution of Alkyl Halides **Turn the completed worksheet in with your notebook pages for this experiment. Review 13 C NMR: There are two 13 C NMR spectra shown below one corresponds to n-butylbromide and the other to tert- butylbromide. Determine which alkyl bromide is responsible for each and draw the structure on the spectra. Number each different kind of carbon for each molecule, then indicate which peak corresponds to each kind of carbon by writing the number above the peak. New: 1 H NMR Similar information can be taken from 1 H NMR spectra. Number of peaks : The number of peaks expected in a 1 H NMR spectra should theoretically be equal to the number of unique hydrogen atom environments (chemical shift equivalent hydrogens) in a molecule. We looked at the 13 C NMR spectra of the following molecules a few weeks ago. Lets now consider their 1 H NMR spectra (included near the end of this handout): 1-Bromopropane contains three different kinds of hydrogens: 1) two equivalent H a 2) two equivalent H b , and 3) three equivalent H c . We would expect to find 3 peaks in the 1 H NMR. This is indeed the case, though it is noteworthy that the peaks do not show up as single lines in proton NMR as they did in carbon NMR, but...
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