Quiz5_000 - 4. (5pts) On the spectrum below, mark each...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Quiz 5 S343 Summer 2009 (This exam has 23 points. You can earn a maximum of 20 points.) 1. (4pts) For the molecule below, give the range of splitting (in Hz) that you would expect to see on a proton NMR spectrum between each of these sets of protons: 2. (6pts) Given these coupling constants, describe the type of signal you would expect to see for each of these protons (singlet, doublet of doublets, etc.). J BC = 16Hz, J CD = 4Hz, J CE = 4 Hz, J DE = 12 Hz, J DF = 7Hz, J EF = 7Hz, J FG = 7Hz,all others 0 Hz). Which of these can be simplified to the n+1 rule? 3. (2pts) Why isn’t splitting observed with exchangeable protons? For example, why does the 1 H NMR of CH 3 OH have 2 singlets rather than a quartet and doublet?
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 2
Background image of page 3
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: 4. (5pts) On the spectrum below, mark each signal with the letter of the proton set to which it corresponds in trans-2-butenoate. There are blow-ups of the signals on the next page. 5. (3 pts) How would you describe the signals at about 6.94ppm, 5.80 ppm, and 1.83 ppm? 6.94 ppm: ____________________________ 5.8ppm: _________________________ 1.83 ppm: _____________________________ 6. (3pts) Use the values given on the blown-up spectra to calculate the following coupling constants. Show your work. (The values are already given in Hz, so you dont have to convert from ppm to Hz in this problem.) J AB ________Hz J AC ________Hz J BC ________Hz Blown-up signals from trans-2-butenoate...
View Full Document

Page1 / 3

Quiz5_000 - 4. (5pts) On the spectrum below, mark each...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online