17) The partial chemical structure and ¹H NMR spectrum of 2-propanol (C3H80) are in the hydrogen atoms and label them with a subscript that corresponds to the labeled peaks in the ¹H NMR spectrum. Provide a brief rationale for your structural assignments. 11 10 9 8 7 6 Peak 1: 4.01 ppm 1H Septet T 5 1 4 Peak 2: 2.16 ppm 1H Singlet 3 Peak 3: 1.20 ppm 6H Doublet HSP-03-214 ppm Rationale for peak assignments in structure: 2 1 0 Draw in labeled hydrogen atoms (H₁, H₂, H3) and assign them to peaks 1-3 H 2 C Structure of 2-propanol -H 11.1
17) The partial chemical structure and ¹H NMR spectrum of 2-propanol (C3H80) are in the hydrogen atoms and label them with a subscript that corresponds to the labeled peaks in the ¹H NMR spectrum. Provide a brief rationale for your structural assignments. 11 10 9 8 7 6 Peak 1: 4.01 ppm 1H Septet T 5 1 4 Peak 2: 2.16 ppm 1H Singlet 3 Peak 3: 1.20 ppm 6H Doublet HSP-03-214 ppm Rationale for peak assignments in structure: 2 1 0 Draw in labeled hydrogen atoms (H₁, H₂, H3) and assign them to peaks 1-3 H 2 C Structure of 2-propanol -H 11.1
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Transcribed Image Text:**1H NMR Analysis of 2-Propanol (C₃H₈O)**
**Question 17:**
The partial chemical structure and ¹H NMR spectrum of 2-propanol (C₃H₈O) are shown. Draw in the hydrogen atoms and label them with a subscript that corresponds to the labeled peaks in the ¹H NMR spectrum. Provide a brief rationale for your structural assignments.
### NMR Spectrum Details:
- **Peak 1:**
- Chemical shift: 4.01 ppm
- Integration: 1H
- Splitting pattern: Septet
- **Peak 2:**
- Chemical shift: 2.16 ppm
- Integration: 1H
- Splitting pattern: Singlet
- **Peak 3:**
- Chemical shift: 1.20 ppm
- Integration: 6H
- Splitting pattern: Doublet
### Structure of 2-Propanol:
- Hydrogen atoms labeled as H₁, H₂, and H₃:
```
H₁
|
H₃ - C - H₃
|
H₂ - C - C - H₃
|
H₃
```
### Rationale for Peak Assignments:
- **Peak 1 (4.01 ppm):** Assigned to H₂, which is the hydrogen on the carbon bonded to the oxygen. This environment leads to a higher chemical shift due to the electron-withdrawing effect of the oxygen. The septet pattern results from coupling with the adjacent six hydrogen atoms (H₃).
- **Peak 2 (2.16 ppm):** Assigned to OH proton. The singlet pattern arises because this proton typically does not couple with adjacent protons.
- **Peak 3 (1.20 ppm):** Assigned to H₃, the hydrogens on the terminal methyl groups. The lower chemical shift is typical for hydrogens far from electronegative atoms. The doublet arises from coupling with a single adjacent hydrogen (H₂).
**Graph Explanation:**
The NMR spectrum graph shows intensity (y-axis) versus chemical shift in ppm (x-axis). Each peak corresponds to distinct hydrogen environments within the 2-propanol molecule, with integration values indicating the number of
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