Using proton NMR spectra, how could a chemist distinguish between the followingtwo compounds?H.H.СОСНPhCOCH;PhH.Compound ACompound BThe alkene protons in compound A display a larger coupling constant.Compound A and compound B show a different number of signals in the proton spectrum.The alpha alkene proton would be more shifted than the beta alkene proton in compound BProton NMR spectroscopy cannot be used to distinguish between these compounds.The alkene protons in compound B display a larger coupling constant.

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Answered: Using proton NMR spectra, how could a…

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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4 A) The NMR of virstatin ethyl ester shows a deshielded triplet around 4.3 ppm and a deshielded quartet around 4.15 ppm. On the section of virstatin ethyl ester shown below UNAMBIGUOUSLY show which hydrogens in the molecule are giving rise to the deshielded quartet. (The deshielded triplet is from the CH2 group attached to the nitrogen). w - yya m rial I vietstia athy ter [ppm) 4B) 4.a (ppm) The above section of an NMR was taken from a student sample of this experiment. You see while the 2H triplet is still present at around 4.3 ppm, the 2H quartet is gone, replaced by a 3H singlet. As well a 3H triplet at 1.4 ppm also is missing from the NMR. Looking at the procedure for purifying virstatin ethyl ester you see that the ethyl ester is boiled in methanol. It appears that transesterification may occur in this process, resulting in virstatin methyl ester. In light of this statement explain the 3H singlet shown above and the missing 3H triplet. You may draw structures to help in your…
Do you think 'H NMR or 1°C NMR spectroscopy would be more suitable for distinguishing among compounds A, B, and C? Explain. A
4. Deduce the structure of a compound with the molecular formular C8H10O that exhibits the following ¹H NMR and ¹³℃ NMR spectra. (6 pts) Proton NMR 22 7 Carbon NMR There are two. 160 unresolved lines at 130 ppm 140 120 5 Chemical Shift (ppm) 100 80 60 Chemical Shift (ppm) 40 3 20 2V 0
2. The compound with the closed formula C4H9Br gives the following 1H NMR data. Write the clear formula of the compound with reasons. 1.0 ppm (triplet, 3 H); 1.7 ppm (dublet, 3H); 1.8 ppm (multiplet, 2H); 4.2 ppm (multiplet, 1H)
1512.99 1509 70 as00. 78 1497.96 1489.04 1485 75 QUESTION 1 CH3 3.1 3.0 2.9 H NMR signal for broton at position X/Y The atoms at positions X and Y in compound A above are a Cl and a H. By analysing the multiplet structure for the H atom located at either position X or Y in 'H NMR spectrum for A, determine whether the H atom resides at position X or Y? Fully explain your reasoning.
Consider the 'H NMR of N,N-diethyl p-toluamide. How many proton signals would you expect to find in for this compound? O 1) 6 O 2) 3 O 3) 4 4) 5
An unknown compound reacts with ethyl chloride and aluminum trichloride to form a compound that has the following 1H NMR spectrum. What is the structure of the compound?
13.45 Propose structures for the two compounds whose 'H NMR spectra are shown. (a) C4H9B1 Chem. Rel. alle shift area 1.05 6.00 1.97 1.00 3.31 2.00 TMS O ppm 10 8. 7 6 3 2 Chemical shift (6) (b) C4H§C12 Chem. Rel. shift area 1.56 3.00 2.13 2.00 3.72 2.00 4.25 1.00 TMS 10 9. 8. 7 6 4 3 2 1 O ppm Chemical shift (8) Intensity Intensity
Which set of H's in the phenacetin analog shown below correspond to HA/HA' in the 1H NMR spectrum shown below? Phenacetin1HNMR Chem235.12.fid 7.9 7.8 7.7 7.6 HA/HA' HB/HB' N A/A' 7.5 11 Group 1 one H3C 10 B 7.2 7.1 7.0 F1 (ppm) C/C' ZI 6.8 6.7 6.6 6.5 6 f1 (ppm) 5 [Choose ] [Choose ] CH3 Group 2 900 -800 700 -600 -500 400 -300 -200 100 -0 > -3800 3600 3400 3200 -3000 2800 2600 2400 -2200 -2000 1800 -1600 1400 - 1200 -1000 -800 600 -400 -200 -200
How many unique proton signals are seen in the H1 NMRH1 NMR spectrum of ethanol? number of unique proton signals: How many unique proton signals are seen in the H1 NMRH1 NMR spectrum of ethanol after shaking with D2O?D2O? number of unique proton signals:
An unknown compound reacts with ethyl chloride and aluminum trichloride to form a compound that has the following 1H NMR spectrum. What is thestructure of the compound?
How could you use 'H NMR to distinguish between the following pair of compounds? Explain your answer clearly. and

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