Author: Anonymous

Consider the following problem.

Which of the following electromagnetic radiation is used in NMR spectroscopy?

A compound, with molecular formula C5H10Br2, displays the following 13C NMR along with the DEPT-90 and DEPT-135 13C NMR spectra. What is the structure for this compound?

There are 5 degrees of unsaturation in the compound found in this combined spectra problem. Briefly describe where each of those degrees of unsaturation come from. (What functional group, is it double bond, triple bond, rings. Be specific) You may need to scroll up to see the spectra.

Predict the pattern (multiplicity) of each signal in the expected 1H NMR spectrum of the following compound. Be as clear as you can (Ha = pattern, Hb = pattern etc. ) Do not write multiplet for a complex pattern. You should be able to report the complex pattern if necessary.

Which compound matches the spectra given in this combined spectra problem?

Which of the following is true about the shape (multiplicity or pattern) of the signal in a 1H NMR spectrum?  

For the following reaction that transforms a nitrile into an amide, explain how you will use IR spectroscopy to monitor the progress of the reaction.  (What signals would disappear and/or appear to let you know the reaction has been successful)

Calculate the degree of unsaturation for C5H5Br2NO.  Just type in the number.

Make sure to provide an answer for each of the four main questions below. Consider the following set of spectra. The notes above the signals in the proton NMR tell you the chemical shift, integration, pattern, and coupling constant (aka J value) Answer each question. 1. What do you see in the IR? Talk about signal and what bond it represents. 2. How many degrees of unsaturation? 3. What structural information can you take from the proton NMR?     – How many types of H? Do any of the chemical shifts tell you about the structure? 4.  What structural information can you take from the proton NMR?     – How many types of Carbon? Can you tell anything from the chemical shifts?