2. What is the structure of the C,H,Br compound which gives rise to this 'H spectrum?The red numbers are the integration (number of hydrogens).Explain your reasoning.4765Chemical shift (5)3TMS432101,102>

Step 1: 1H NMR1H NMR (proton nuclear magnetic resonance spectroscopy) is a powerful analytical…

Answered: 2. What is the structure of the C,H,Br…

Organic Chemistry: A Guided Inquiry

2nd Edition

ISBN:9780618974122

Author:Andrei Straumanis

Publisher:Andrei Straumanis

ChapterL3: Carbon (13c) Nmr Spectroscopy

Section: Chapter Questions

Problem 8E

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There are four structural isomers that are alcohols with the formula C4H9OH. (a) The numbers of peaks, and the areas under them, in the 1H NMR spectra of these alcohols can be used to identify them. i. Explain why the 1H NMR spectrum of (CH3)2CHCH2OH has four peaks. Predict the ratio of the areas under the peaks. ii. Deduce the structure of the alcohol whose 1H NMR spectrum has two peaks with areas in the ratio 9:1.
The 'H NMR spectrum of 1,2-dimethoxyethane (CH;OCH,CH2OCH3) recorded on a 300 MHz NMR spectrometer consists of signals at 1017 Hz and 1065 Hz downfield from TMS. (a) Calculate the chemical shift of each absorption. (b) At what frequency would each absorption occur if the spectrum were recorded on a 500 MHz NMR spectrometer?
SPECTROSCOPY - Attached are the IRs for Caffeine and Adenine (Molecular structures on Lab Manual p. 34). Please (a) NAME each compound at the bottom of each spectrum box. (b) Label the major peaks with the proper functional group for each spectrum. 100- Transmittance (%) Transmittance (%) 50- 4000 100 50 3303 34 1673 10 3123 20 1605 4 2982 42 1508 74 2800 43 1471 72 2710 50 1463 74 2892 49 1451 65 2601 68 1419 36 0 4000 3000 2925 4 2854 14 1699 10 1859 10 1699 49 3110 64 1649 31 2954 11 1457 21 1431 37 1404 56 1378 49 1360 49 1326 68 1368 60 1334 43 1309 27 1263 46 1156 81 1126 88 1023 72 3000 1286 63 1240 36 1213 80 1189 62 1072 77 1026 57 974 68 2000 1500 Wavenumber (cm-¹) 940 38 913 55 875 77 849 72 797 64 792 84 724 49 643 49 622 60 543 57 2000 1500 Wavenumber (cm-¹) 81 927 873 77 851 74 769 60 746 23 700 84 646 84 wwwm 638 86 610 57 482 49 1000 -END- 500 1000 500 38
Draw the structural formulas of the following compounds and indicate the number of NMR signals that would be expected for each compound. (a) methyl iodide (b) 2,4-dimethylpentane (c) cyclopentane (d) propylene (propene)
Indicate which of the following statements is true:(A). Three signals will appear in the proton spectrum of CICH=CH2(B). Two signals will appear in the proton spectrum of o-chloromethylbenzene(C). The protons of BrCH2-CH3 with the highest chemical shift are the methyl ones(D). The methyl protons of BrCH2-CH3 give 5 signals
Identify the significant absorption peaks by labeling them right on the spectrumand includethe spectrum in your laboratory report. Absorption peaks corresponding to the followinggroups should be identified: C—H (SP3) C—H (SP2) C—H (aldehyde) O—H C=O C=C (aromatic)aromatic substitution pattern C—OC—X (if applicable)
6. Sketch on graph paper the appearance of the A2MsX2, ¹H-NMR spectrum where A, M, and X represent groups of protons with distinctly different chemical shifts and JAM>JAX >JMX.
4. Ethyl acetate and 2-butene-1,4-diol both have the molecular formula C4H8O2. How would you use infrared spectroscopy to distinguish between the two? Provide a thorough explanation.
6) Complete the spectroscopy data tables for a compound with molecular formula C6H12O. Determine the structure of the compound. Any labile protons, if they exist, will not be present in this particular 1H NMR spectrum.
The spectrum below was obtained from KBr sharing, being a compound with formula C2H6O. Determine the compound from the if FTIR spectrum. (b) Discuss how FTIR distinguishes the following compounds: (i) CH3OH and CH3CH2OCH2CH3 (c) which functional groups provide signals in the FTIR spectra: (i) 1700cm-1, (ii) 1550 cm-1 and (iii) 1700 cm-1 and 2510-3000 cm-1
As shows the NMR spectrum of ethanol. Account for the observed chemical shifts.
1) Complete the spectroscopy data tables for a compound with molecular formula C8H8O. Determine the structure of the compound. Any labile protons, if they exist, will not be present in this particular1H NMR spectrum.

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2. What is the structure of the C,H,Br compound which gives rise to this 'H spectrum? The red numbers are the integration (number of hydrogens). Explain your reasoning. 4 7 6 5 Chemical shift (5) 3 TMS 4 3 2 1 0 1,102>