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4. Match the protons in the molecule with their 'H NMR signals. B нн нн ethyl butyrate (piña colada) H. A H1 `HE H нн 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 PPM 0.5 2 2 2 3 3.

4. Match the protons in the molecule with their 'H NMR signals. B нн нн ethyl butyrate (piña colada) H. A H1 `HE H нн 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 PPM 0.5 2 2 2 3 3.

Chemistry
Chemistry
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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
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**Matching Protons in Ethyl Butyrate with Their NMR Signals** **Chemical Structure:** The molecule displayed is ethyl butyrate, commonly associated with the aroma of piña colada. It consists of identifiable protons, labeled as A, B, C, D, and E, arranged on the molecular structure: - A: Methyl group at the end of the chain. - B & C: Methylene groups in the chain. - D & E: Methylene and methyl groups attached to oxygen. **NMR Spectrum Analysis:** The NMR spectrum provided illustrates the chemical shifts of protons in ethyl butyrate. The x-axis represents the chemical shift in parts per million (PPM), ranging from 4.5 to 0.5 PPM. The peaks correspond to different proton environments in the molecule. 1. **At ~4.1 PPM**: - This region shows a triplet indicative of protons adjacent to an electronegative atom, likely corresponding to protons D (methylene group attached to oxygen). 2. **At ~2.3 PPM**: - Here, a quartet is visible, which likely corresponds to protons B or C that are part of the methylene group adjacent to the carbonyl group. 3. **At ~1.8 PPM**: - This signal is a multiplet, possibly representing the protons of the methylene group (proton C) within the carbon chain. 4. **At ~1.2 PPM**: - This area depicts a triplet, likely attributable to the terminal methyl group (proton A) on the ethyl side of the ester. 5. **At ~0.9 PPM**: - The singlet here indicates the presence of the isolated methyl protons (proton E) at the end of the butyrate chain. This spectrum allows for the clear identification and matching of the protons with their respective environments in the ethyl butyrate molecule. Understanding these shifts is crucial in structural elucidation using NMR spectroscopy.
Transcribed Image Text:**Matching Protons in Ethyl Butyrate with Their NMR Signals** **Chemical Structure:** The molecule displayed is ethyl butyrate, commonly associated with the aroma of piña colada. It consists of identifiable protons, labeled as A, B, C, D, and E, arranged on the molecular structure: - A: Methyl group at the end of the chain. - B & C: Methylene groups in the chain. - D & E: Methylene and methyl groups attached to oxygen. **NMR Spectrum Analysis:** The NMR spectrum provided illustrates the chemical shifts of protons in ethyl butyrate. The x-axis represents the chemical shift in parts per million (PPM), ranging from 4.5 to 0.5 PPM. The peaks correspond to different proton environments in the molecule. 1. **At ~4.1 PPM**: - This region shows a triplet indicative of protons adjacent to an electronegative atom, likely corresponding to protons D (methylene group attached to oxygen). 2. **At ~2.3 PPM**: - Here, a quartet is visible, which likely corresponds to protons B or C that are part of the methylene group adjacent to the carbonyl group. 3. **At ~1.8 PPM**: - This signal is a multiplet, possibly representing the protons of the methylene group (proton C) within the carbon chain. 4. **At ~1.2 PPM**: - This area depicts a triplet, likely attributable to the terminal methyl group (proton A) on the ethyl side of the ester. 5. **At ~0.9 PPM**: - The singlet here indicates the presence of the isolated methyl protons (proton E) at the end of the butyrate chain. This spectrum allows for the clear identification and matching of the protons with their respective environments in the ethyl butyrate molecule. Understanding these shifts is crucial in structural elucidation using NMR spectroscopy.
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