Concept explainers
(a)
Interpretation:
The compound
Concept introduction:
In NMR spectroscopy, every nucleus has a spin. There is an
(b)
Interpretation:
The compound
Concept introduction:
In NMR spectroscopy, every nucleus has a spin. There is an angular momentum related to the spin. The difference between its resonance frequency and that of the reference standard is known as the chemical shift of a nucleus. The chemical shift value depended upon its surrounded protons.
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Organic Chemistry
- Predict how many 13C-NMR resonances o-bromobenzamide contains in its spectraarrow_forwardWhen heated with chromic acid, compound A forms benzoic acid. Identify compound A from its 1H NMR spectrum.arrow_forwardWhen treated with an equivalent of methanol, compound A, with molecular formula C4H6Cl2O, forms the compound whose 1H NMR spectrum is shownhere. Identify compound A.arrow_forward
- Compound X (molecular formula C10H120) was treated with NH2NH2, ¯OH to yield compound Y (molecular formula C10H14). Match the 1H NMR spectra of X and Y to the corresponding structures of X and Y. Compound NH2NH2 Compound 'H NMR of X 6 H OH Y 1 H 5H 8. 6. 4 ppm or H NMR of Y 6 H 2H 5H 1 H multiplet multiplet 8. 6. 4. 3. 1 nnm 2. 2. 3, O:arrow_forwardThe 1H-NMR spectrum of Compound C shows five signals – δ 2.38 (1H, dt), 2.72 (1H, dt), 5.34 (1H, t), 5.49 (2H, ddd), 6.27 (2H, dd) ppm. Its 13C-NMR spectrum has four signals – δ 26, 58, 127, 129 ppm. In the compound’s mass spectrum, the M+1 peak appears at m/z = 115. An M+2 peak, whose intensity is roughly one-third that of the M+1 peak, also appears. Suggest a structure for this compound.arrow_forwardCompound A shows a molecular peak of 56 in Mass Spectrum. When compound A is treated with HBr and peroxides, it produces compound B, which shows twin molecular peaks with weights 136 and 138 in 1:1 ratio. The 'H NMR spectra of both compounds shown below. Identify the structures of A and B in the respective boxes. 2H Compound A 'H NMR of Compound A (integration is listed next to peaks) لد HBr peroxides 2H PPM 'H NMR of Compound B (integration is listed next to peaks, expansions in above) М 1H Compound B PPM 6H 6Harrow_forward
- What is the 1H NMR data (chemical shift, integration, multiplicity (specify as singlet, doublet, triplet,etc.) of the following two compounds?arrow_forward1. Identify the compound (C4H₂O₂) that gives the following ¹H NMR spectrum. 3H 2H PPM 3Harrow_forwardThe structure of an ester could either be A or B: CH3 O O CH3 T || -C-OCH3 CH3-C CH3-C-O-C-CH3 CH3 CH3 A B Its ¹H NMR spectrum consists of two peaks at 80.9 and 83.6 (relative areas 3:1). Which compound is it? Describe the spectrum that would be expected if it had been the other ester.arrow_forward
- Compound X (molecular formula C10H12O) was treated with NH2NH2,−OH to yield compound Y (molecular formula C10H14). Based on the 1H NMR spectra of X and Y given below, what are the structures of X and Y?arrow_forwardWhat is the structure of the compound with the formula C4H10O, if it shows 1H-NMR spectrum: 1.20 ppm (6H doublet) 3.30 ppm (3H singlet) 3.55 (1H septet)arrow_forwardAn unknown compound C of molecular formula C6H12O3 exhibits a strong absorption in its IR spectrum at 1718 cm−1 and the given 1H NMR spectrum. What is the structure of C?arrow_forward
- Organic ChemistryChemistryISBN:9781305580350Author:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. FootePublisher:Cengage Learning