OBLEMS:1. Assign each of the following spectral data descriptions of complex coupling to the indicatedhydrogens in the structural units below that most closely fits the splitting pattern.a. triplet of doublets, J= 8 Hz, J= 3 Hzb. doublet of doublets, J= 15 Hz, J= 10 HzC.doublet of doublet of doublets, J= 12 Hz, J= 6 Hz, J= 2 HzHHHHH.CICIH HHCl-HHDBrH

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Answered: OBLEMS: 1. Assign each of the following…

Organic Chemistry: A Guided Inquiry

2nd Edition

ISBN:9780618974122

Author:Andrei Straumanis

Publisher:Andrei Straumanis

ChapterL3: Carbon (13c) Nmr Spectroscopy

Section: Chapter Questions

Problem 5E

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Would you expect two enantiomers such as (R)-2-bromobutane and (S)-2-bromobutane to have identical or different IR spectra? Explain.
3. Which C7H₁40 isomers give rise to the spectra shown below? (Hint: the IR spectra of both molecules would contain a strong peak at ~1710 cm-¹.) a. C. 8 7 8 7 6 5 5 4 8 (ppm) 4 8 (ppm) Note: From left to right, the peak multiplicities are septet and doublet. 3 3 2 All singlets 2 1 0 0
1. An aliphatic ketone absorbs at 1,715 cm-1. What is the frequency of this vibration in hertz, which is cycles per second or just per second, reciprocal seconds? 2. What is the energy equivalent of this stretching vibration in kcal/mole? 3. Why does 3,4-diethyl-3-hexene not have a carbon to carbon double bond stretching absorption band? 4. Why does a carbon to oxygen double bond absorption band have a greater intensity than a carbon to carbon double bond absorption band? 5. Using only IR, explain in detail how one could most easily differentiate between oct-1-ene and oct-1-yne if all carbon to carbon bonds are ignored. 6. Using only IR, explain in detail how one could most easily differentiate between butan-1-ol and butanoic acid.
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1. Fill in the boxes in the following problem. Hint: The number of NMR peaks tells you about the symmetry of the molecule. 1¹H peak HCI A C4H8 Cl₂ 2 ¹H peaks
(All spectra are from the AIST database) 1. For following IR spectra: A. Identify the functional groups and bond types present in the molecule. B. Label peaks in the IR spectra below. Pentane CSH12 LOD 4000 3000 200 1500 1000 500 HAVENUMBERI -|l TRANSMITTANCEII
If attached to a stereocenter, which of the following groups would have the highest priority with respect to determining whether the configuration for the stereocenter is R or S? a. -CH2OH b.-NH2 c. (attached image)
(Please answer questions in a different font color or with handwriting.) 1. Identify the compounds that display IR spectra with the following peaks; A. C₂H₂O₂Cl - 3200-2500 (broad), 1720, 1410 cm-¹ Carboxilic ocid Ketone C-CI B. C8HgO -3030, 2820, 2760, 1715, 1605, 1595, 1495, 1410, 750, 695 cm-¹ 1 G-C all simple bord C-sp²-4 alteve 4-705-7 СИО Alkene <- CHO C30 C. C₂H₂O-3020, 2970, 1695, 1600, 1480, 1435, 760, 690 cm-¹ 23:3 IND = 2 Ino: S 2. Identify/list IR signals that could be used to distinguish between the following pairs of compounds; There may be more than one for each pair, list them all. Ou- streching m
Match the four structures with the four IR spectra (by putting a proper letter in the box to the right of each spectrum). Use specific IR absorptions for various functional groups to identify the structures.
determine the chemical structure

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