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A: absorbance range= 0.4-0.9
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Q: NO: OCH, 6.37 5.93 8.2 7.5 H. 4.65 6.8 7.7
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Q: 200 180 160 140 120 100 80 60 40 20 CDS-43-540 pm
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Q: label IR peaks and give the name of the compound (explain)
A: IR spectra is useful tool to identify the functional groups of the unknown compound.
Q: Compound 10: C10H10O3 8 6 5 4 3 2 1 d(2 H) d(2 H) s(3 H) s(3 H) 200 150 100 50 CR200701473NY pom
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Q: 11 10 8 7 6 5 4 3 2 m(1 H) s(6 H) d(6 H) - o
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Q: Compound 9: C6H15N 11 10 8. 7 6 4 3 2 1 t(4 H) s(1 H) m(4 H) t(6 H) 200 180 160 140 120 100 80 60 40…
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- When the 1HNMR spectrum of an alcohol is run in dimethylsulfoxide (DMSO) solvent rather than in chloroform, exchange of the Ο-H proton is slow and spin-spin splitting is seen between the Ο-H proton and C-H protons on the adjacent carbon. What spin multiplicities would you expect for the hydroxyl protons in the following alcohols? (a) 2-Methyl-2-propanol (b) Cyclohexanol (c) Ethanol (d) 2-Propanol (e) Cholesterol (f) 1-Methylcyclohexanol3-Bromo-1-phenyl-1-propene shows a complex NMR spectrum in which the vinylic proton at C2 is coupled with both the C1 vinylic proton (J = 16 Hz) and the C3 methylene protons (J = 8 Hz). Draw a tree diagram for the C2 proton signal, and account for the fact that a five-line multiplet is observed.3-Methyl-2-butanol has five signals in its 13C NMR spectrum at 17.90, 18.15, 20.00, 35.05, and 72.75 . Why are the two methyl groups attached to C3 nonequivalent? Making a molecular model should be helpful.
- 3. For the given molecules 1 H NMR (a) label all the hydrogen atoms, (b) State how many signals are possible (c) Predict chemical shift values (d) and Multiplicity. CH, *CH, 1-pentene 3-methylbutanal p-ethylanisole HO, Br butanoic acid 2-bromobutane diethyl malonate OH Br 1-propanol 1-bromopropane diethyl ethylmalonate(3) These natural compounds will have different numbers of 1H-NMR signals in different NMR solvents like CDC13 and methanol-d4. How many signals do you anticipate for each compound respectively in CDC13 and methanol-d4? LOCH 3 OHC. vanillin OH LOH acetoaminophen HO thymolFollowing is a 1H-NMR spectrum of 2-butanol. Explain why the CH2 protons appear as a complex multiplet rather than as a simple quintet.
- A'2 The 'H-NMR spectra of cyclohexanol and cyclohexanone are given below. Identify which spectrum belongs to which compound and assign the peaks in each spectrum that substantiate your decision.Following are the 'H and 13C NMR spectra for each of three isomeric ketones with formula C7H14O. Determine a structure to each pair of spectra and assign each H and C. Carbon spectrum А C,H140 Carbon spectrum В C;H140 CDCI3 200 150 100 50 Proton spectrum CDC13 A C,H140 200 150 100 50 1.96 2.00 2.91 3.0 2.5 2.0 1.5 1.0 0.5 0.0 211.04 -44.79 –17.39 – 13.78 -218.40 - 38.85 –18.55These are four alcohols with the formula C4H10O. One of them produced this C-NMR spectrum, which alcohol did that and what carbons correspond with what peaks?
- Draw the structure of the compound identified by the simulated 'H NMR and 13C NMR spectra. The molecular formula of the compound is C1,H120. (Blue numbers next to the lines in the 'H NMR spectra indicate the integration values.) Η NMR 1H 2H 2H 2H 2H 3H| 10 8 4 2 8 (ppm) 13C NMR 220 200 180 160 140 120 100 80 60 40 20 d (ppm)(a) Rank each proton shown below in terms of relative chemical shift in the ¹H NMR spectrum. (1 = most upfield, 3 = most downfield) (i) (iii) H JO [ ⒸDraw the structure of the compound identified by the simulated 'H NMR and C NMR spectra. The molecular formula of the compound is C,0H,O. 12 (Blue numbers next to the lines in the 'H NMR spectra indicate the integration values.) H NMR 1H 2H 2H 2H 2H|| 3H 10 8. 4 (dd) g 13C NMR 220 200 180 160 140 120 100 80 60 40 20 8 (ppm) Deduce the structure from the spectra. Select Draw Rings More Erase