Graph 1:3-Methyl-1-butyl ethanoate H' NMR 1H b 2H a 6H 3H 2H Table 1: Interpretation of H' NMR for 3-Methyl-1-butyl ethanoate Chemical Shift (8) Peak Multiplicity H* a C b.
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- Assign as many resonances as you can to specific carbon atoms in the 13C NMR spectrum of ethyl benzoate.4- How many proton signals appear in the 1H NMR spectrum of vinyl chloride? a) three signs b) two signs c) four signs 5- A compound with the general formula CHO showing one single signal in the NMR spectrum. The compound is: - a) 2--propanone b) cyclo propanol c) propanal| 6- a) m/e 66 b) m/e= 68 c) m/e= 69 The following compound is given by mass spectrometry, M.wt = 108, its peak at ....Q3/A) How many signals 'H NMR be expected in the following molecules ? ( 1) 5-methyl-3-hexanone 2) acetone 3) 4-methylacetophenone 4)1-propanol 5) cinammic acid 6 (14 Mould)
- The H-NMR below represents a b benzoin benzil PPM F3 -~Methyl ethyl ether (shown below) has an -OCH 2 - group, an -OCH 3 - group, and a methyl group. The ' H NMR spectrum displays a quartet at 3.5 ppm, a signal at 3.0 ppm, and a signal at 1.2 ppm. Using the data in the table, what is the correct assignment of the spectrum? H H. H. Proton Environment Chemical Shift (8,ppm) Methylene, -C H 2 - 0.3 - 1.2 Methyl, -C H 3 1.1 - 1.9 Alkoxy, -OC H 2/3 3.3 - 4.0 -OC H 3 = 3.5 ppm (quartet), -OC H 2 = 3.0 ppm (singlet), -C H 3 = 1.2 ppm (triplet) -OC H 3 = 1.2 ppm (singlet), -OCH 2 3.5 ppm (quartet), -C H 3 = 3.0 ppm (triplet) -OC H 3 = 3.0 ppm (singlet), -OCH 2= 3.5 ppm (quartet), -C H 3 = 1.2 ppm (triplet) -OC H 3 = 3.5 ppm (quartet), -OC H 2 1.2 ppm (triplet), -C H 3 = 3.0 ppm (quartet) -OC H 3 = 1.2 ppm (singlet), -OCH 2= 3.0 ppm (doublet), -C H 3 = 3.5 ppm (quartet) -OC H 3 = 3.0 ppm (triplet), -OC H 2 = 3.5 ppm (quartet), -C H 3 = 1.2 ppm (triplet)For the following 9 compounds (most of which were the ones used in this lab), tell me what peaks you would expect to see in the 'H-NMR spectrum of those compounds. I have provided table for you to fill out with approximate chemical shift (ppm units), peak multiplicity_(singlet, doublet, etc.) and integration of the signal (how many protons would give that signal). No IR data is required. In addition, tell me the number of 13C-NMR signals you would expect to see [specific 13C shifts are not required] Predict
- НА ОН HB 2-indanol ОН -HA 1-indanol - Нв (b) Estimate the ¹H chemical shift for HB of 2-indanol and HA of 1-indanol. Is one more downfield than the other or are they expected to be similar? Explain your answer.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 ethylmalonateConsider the following 1H NMR Spectrum for the following Compound. Which proton(s) are represented by signal 1? 10 O D OC B O A OF OE 1H SIGNAL 1 -co 5H SIGNAL 2 B HH 1H 1H to D HH F HHH CE 2H SIGNAL 3 2H SIGNAL 4
- 12 olot Sketch of ¹H NMR spectrum: ¹H NMR ofot 220 13C NMR sketch Chemical Shift (ppm) Chemical Shift (ppm) 0 0Following is a 'H-NMR spectrum for a compound of molecular formula C,H,,0. From the integration, calculate the number of hydrogens giving rise to each signal. C,H1,02 26 18 44 10 9 8 7 6. 4 3 2 1 0 ppm Chemical shift (8)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?