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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Propose a structure that is consistent with the following 1H NMR spectra. In each case, the molecular formula is provided. For spectra with numbers at the bottom of the signal you will need to determine the integration, others with numbers above the signal integration has been determined for you.
Transcribed Image Text:### NMR Spectrum Analysis
#### Spectral Details:
- **Compound:** C₉H₁₂
- **Technique:** Proton NMR (Nuclear Magnetic Resonance)
#### Graph Explanation:
- **X-axis:** Chemical Shift (ppm, parts per million)
- **Y-axis:** Signal Intensity (arbitrary units)
#### Peaks:
1. **Chemical Shift Region:**
- approximately **0.9 ppm**: Label 6
- Represents a signal likely corresponding to a type of protons, possibly indicating a methyl group (alkane protons).
- approximately **2.1 ppm**: Not labeled
- Potential signal for aliphatic protons adjacent to a functional group.
- approximately **3.1 ppm**: Label 1
- A more complex signal, possibly indicating a methylene group (CH₂) or protons near an electronegative atom.
- approximately **7.2 ppm**: Label 5
- Typically, aromatic protons, suggests a benzene ring in the structure.
#### Additional Information:
- **Multiplet Patterns:** Peaks demonstrate complex splitting, indicative of neighboring proton interactions.
- **Interpretation:** The spectrum reveals multiple environments for protons within the compound C₉H₁₂, suggesting structural features like aromatic rings and alkyl groups.
This NMR spectrum assists in elucidating the molecular framework by analyzing the chemical shift and peak patterns, leading to the determination of molecular structure.
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