Q-1. Study the structure of this molecule and answer the following questions: 6. 7 10 3 8 i) How many different "C-NMR signals you would expect? ii) Which one of the two-carbonyl carbons (C-1 or C-9) has lower chemical shift than the other? Еxplain: iii) What is the chemical shift in IIvalue you would expect for C-8? iv) Which carbon atom in benzene ring is most deshielded?

Q-1. Study the structure of this molecule and answer the following questions: 6. 7 10 3 8 i) How many different "C-NMR signals you would expect? ii) Which one of the two-carbonyl carbons (C-1 or C-9) has lower chemical shift than the other? Еxplain: iii) What is the chemical shift in IIvalue you would expect for C-8? iv) Which carbon atom in benzene ring is most deshielded?

Organic Chemistry

9th Edition

ISBN:9781305080485

Author:John E. McMurry

Publisher:John E. McMurry

Chapter13: Structure Determination: Nuclear Magnetic Resonance Spectroscopy

Section13.SE: Something Extra

Problem 48AP

See similar textbooks

Similar questions

Q-1. questions: Study the structure of this molecule and answer the following 7 10 8 i) How many different 1C-NMR signals yõu would expect? ii) Which one of the two-carbonyl carbons (C-1 or C-9) has lower chemical shift than the other? Еxplain: iii) What is the chemical shift in Ivalue you would expect for C-8? iv) Which carbon atom in benzene ring is most deshielded?
What do the peaks of the C-NMR of C9H12 mean?
Draw the structure of C3H80 and indicate which carbon atoms correspond to which signal in the C NMR spectrum.
Cyclohexane-d1 (C6HD11) exhibits one signal in its "H NMR spectrum at room temperature. Two signals appear in the spectrum, however, when the temperature is lowered significantly, as shown here. Explain why this happens. 0 °C -43 °C -61 °C -78 °C -90 °C Chemical shift
Identify the peaks in the C-NMR of C5H8O.
100 80- 60- 40- 20- 0- 4000 3500 3000 2500 2000 1500 1000 Wavenumber (cm) What information may be revealed from the IR spectrum shown below? (You may need to select more than one option) A) It has alcohol functional group B) The compound has sp3-s sigma bonds C) The compound has sp2-s sigma bonds D) The compound has sp-s sigma bond E) The compound has a carbonyl group % Transmi ttance
13 Q-2. Look at the following "C-NMR spectrum (Lower) and two DEPT spectra (C,H,CI): 131 ppm 140 130 120 110 100 90 80 70 60 50 40 30 20 10 ppm i) Label all the signals as CH,, CH,, CH or C. Put you labels in the lower spectrum. ii) Draw one possible structure for the compound.
4 Which of these C6H14 isomers has the greatest number of ¹3C NMR signals? (a) Hexane (d) 2,2- (b) Dimethylbutane 2-Methylpentane X3-Methylpentane (e) 2.3- Dimethylbutane
Cyclohexane has one signal at room temperature and two signals at low temperature. How many signals would you expect cyclohexanol to have at low temperature in TMS? Your answer must be a single word (no dashes, spaces, or punctuation)
1Compound 1 has molecular formula C7H16. It shows three signals in the 1H-NMR spectrum, one at 0.85 ppm, one at 1.02 ppm, and one at 1.62 ppm. The relative integrals of these three signals are 6, 1, and 1, respectively. Compound 2 has molecular formula C7H14. It shows three signals in the 1H-NMR spectrum, one at 0.98 ppm, one at 1.36 ppm, and one at 1.55 ppm. The relative integrals of these three signals are 3, 2, and 2, respectively. Propose structures for compounds 1 and 2, explaining how you reach your conclusion.
How many peaks appear in the 13C NMR spectrum (protein spin is decoupled) of the compound below? CH3 CH3 H3C CH3
Q10) Identify the unknown compound with the formula CaHjo0z using the following 'H NMR and C NMR. Label all peaks used to make your identification as appropriate. Draw the structure of the unknown compound in the box provided. Answer (structure) ppm 200 180 160 140 120 100 80 60 40 20 CO-12-136