NMR Questions and Answers
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This document discusses NMR problem solving and spectroscopy. It addresses questions about determining the number of signals expected in 1H NMR, 19F NMR, and other NMR spectra based on equivalent protons, equivalent fluorines, and spin-spin coupling. It also considers how NMR spectra would appear for specific compounds with different nuclei such as 13C, 31P, 11B, 19F, and taking into account coupling and chemical shifts.
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NMR Questions and Answers
- 1. NMR Problem solving Dr. Chris, UP Feb 2016
- 3. equivalent protons Protons that can be transferred to another one by mirror or rotation are equivalent => They have the same δ and do not couple
- 4. How many signals ?
- 6. How many 19F signals ?
- 9. equivalent F
- 10. t
- 11. Which F-NMR signals would we expect ? Replace by C6H5 here
- 12. a a b c a b We would expect a broadened triplet for each of the equatorial flourines
- 13. Questions How would the 13C NMR spectrum of: CH3 – CH2 – CH - CH3 | Br look like with and without 1H-13C coupling ? Step 1: identify how many different C atoms ? Step 2: estimate chemical shift Step 3: estimate coupling to adjacent protons.
- 15. How would the spectrum look like for 1H NMR 19F NMR 31P NMR P-H coupling is bigger than F-H P-F - “ - P-F - “ - P-H How is the 1H spectrum of pure 13C- CH4 ? - “ - BH4 - ? - “ - 11B - “ - ? 19F spectrum of TiF4L2 cis and trans ?
- 16. How is the 19F NMR of ClF5 ?