200 200 5 / 5 The data you have been reviewing has been idealized data-data that has been created using a drawing program. Real data is a bit different! Here is a real DEPT spectrum (obtained from the Univ. of Southern Maine) of propyl benzoate, with CNMR below it: Real peaks in DEPT-90 are the same height in all three spectra. CD-03- 160 150 140 75% 120 100 + 100 ppm 00 The "Bleed over peaks" 50 PPM Notice the "bleed over peaks" in the DEPT-90 spectrum - this happens often, but are NOT REAL PEAKS! Real peaks in the DEPT-90 spectrum will be the same height in all three DEPT spectra. Use the DEPT data to assign as many peaks as you can in propyl benzoate.

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Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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Chapter1: Chemical Foundations
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The data you have been reviewing has been idealized data—data that has been created using a drawing program. Real data is a bit different! Here is a real DEPT spectrum (obtained from the Univ. of Southern Maine) of propyl benzoate, with CNMR below it:

**Description of the Graphs:**

1. **DEPT Spectrum:** 
   - The spectrum shows multiple horizontal lines representing different DEPT spectra.
   - The uppermost line indicates "Real peaks in DEPT-90 are the same height in all three spectra."
   - The line below shows "Bleed over peaks," which are marked by red circles.

2. **CNMR Spectrum:**
   - Located below the DEPT spectrum, the CNMR spectrum displays peaks at different PPM values.
   - It includes an inset with the structural formula of propyl benzoate, helping identify the chemical environment of the carbons.

**Important Note:**
Notice the "bleed over peaks" in the DEPT-90 spectrum—this happens often, but these are NOT REAL PEAKS! Real peaks in the DEPT-90 spectrum will be the same height in all three DEPT spectra.

Use the DEPT data to assign as many peaks as you can in propyl benzoate.
Transcribed Image Text:The data you have been reviewing has been idealized data—data that has been created using a drawing program. Real data is a bit different! Here is a real DEPT spectrum (obtained from the Univ. of Southern Maine) of propyl benzoate, with CNMR below it: **Description of the Graphs:** 1. **DEPT Spectrum:** - The spectrum shows multiple horizontal lines representing different DEPT spectra. - The uppermost line indicates "Real peaks in DEPT-90 are the same height in all three spectra." - The line below shows "Bleed over peaks," which are marked by red circles. 2. **CNMR Spectrum:** - Located below the DEPT spectrum, the CNMR spectrum displays peaks at different PPM values. - It includes an inset with the structural formula of propyl benzoate, helping identify the chemical environment of the carbons. **Important Note:** Notice the "bleed over peaks" in the DEPT-90 spectrum—this happens often, but these are NOT REAL PEAKS! Real peaks in the DEPT-90 spectrum will be the same height in all three DEPT spectra. Use the DEPT data to assign as many peaks as you can in propyl benzoate.
**Title: Understanding the CNMR Spectrum of Propyl Benzoate**

**Description:**
This activity involves using the provided spectra and the molecular structure of propyl benzoate to assign the Carbon-13 Nuclear Magnetic Resonance (CNMR) spectrum.

**Structure:**
The image displays a molecular structure where the carbon atoms are labeled from 'a' to 'h'.

**Task:**
Match the CNMR spectral peaks to specific carbons in the propyl benzoate structure.

**Assignments:**
1. The peak at approximately 168 ppm corresponds to carbon [ Select ].
2. The small peak at approximately 130 ppm corresponds to carbon [ Select ].
3. The peak at approximately 66 ppm corresponds to carbon [ Select ].
4. The peak at approximately 22 ppm corresponds to carbon [ Select ].

**Instructions:**
- Analyze each peak and determine which carbon in the structure of propyl benzoate it corresponds to.
- Select the appropriate carbon based on the provided spectrum.

Explore the molecular structure and comprehend how each part of the spectrum reflects different environments of carbon atoms. This exercise assists in developing skills for interpreting CNMR data effectively.
Transcribed Image Text:**Title: Understanding the CNMR Spectrum of Propyl Benzoate** **Description:** This activity involves using the provided spectra and the molecular structure of propyl benzoate to assign the Carbon-13 Nuclear Magnetic Resonance (CNMR) spectrum. **Structure:** The image displays a molecular structure where the carbon atoms are labeled from 'a' to 'h'. **Task:** Match the CNMR spectral peaks to specific carbons in the propyl benzoate structure. **Assignments:** 1. The peak at approximately 168 ppm corresponds to carbon [ Select ]. 2. The small peak at approximately 130 ppm corresponds to carbon [ Select ]. 3. The peak at approximately 66 ppm corresponds to carbon [ Select ]. 4. The peak at approximately 22 ppm corresponds to carbon [ Select ]. **Instructions:** - Analyze each peak and determine which carbon in the structure of propyl benzoate it corresponds to. - Select the appropriate carbon based on the provided spectrum. Explore the molecular structure and comprehend how each part of the spectrum reflects different environments of carbon atoms. This exercise assists in developing skills for interpreting CNMR data effectively.
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