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What are the functional groups in 4-Dimethylaminopyridine? What would you expect there to be in an IR spectrum for N 4-Dimethylaminopyridine?

What are the functional groups in 4-Dimethylaminopyridine? What would you expect there to be in an IR spectrum for N 4-Dimethylaminopyridine?

Chemistry
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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**What are the functional groups in 4-Dimethylaminopyridine? What would you expect there to be in an IR spectrum for 4-Dimethylaminopyridine?** ### Structure Explanation The structure of 4-Dimethylaminopyridine consists of the following components: 1. **Pyridine Ring:** - A six-membered aromatic heterocycle containing five carbon atoms and one nitrogen atom. The lone pair of electrons on the nitrogen can participate in resonance, contributing to the aromaticity of the ring. 2. **Dimethylamino Group:** - Attached to the fourth position of the pyridine ring (para position). - Consists of a nitrogen atom bonded to two methyl groups (–N(CH₃)₂). The nitrogen has a lone pair that can contribute to resonance with the aromatic system. ### IR Spectrum Expectations In the IR spectrum of 4-Dimethylaminopyridine, common absorption peaks to expect include: - **Aromatic C-H Stretch:** Typically found around 3000-3100 cm⁻¹. - **C-N Stretch:** Peaks may appear between 1200-1350 cm⁻¹ due to the single bonds involving nitrogen. - **Aromatic Ring Vibrations:** Multiple peaks can occur between 1400-1600 cm⁻¹, associated with the C=C stretching vibrations. - **N-CH₃ Stretch:** Peaks around 2800-3000 cm⁻¹ due to C-H stretching in methyl groups. - **Other Minor Peaks:** Various peaks due to overtones and combinations in the aromatic ring region and other bending vibrations. These features allow for the identification of functional groups and confirmation of the compound's structure using infrared spectroscopy.
Transcribed Image Text:**What are the functional groups in 4-Dimethylaminopyridine? What would you expect there to be in an IR spectrum for 4-Dimethylaminopyridine?** ### Structure Explanation The structure of 4-Dimethylaminopyridine consists of the following components: 1. **Pyridine Ring:** - A six-membered aromatic heterocycle containing five carbon atoms and one nitrogen atom. The lone pair of electrons on the nitrogen can participate in resonance, contributing to the aromaticity of the ring. 2. **Dimethylamino Group:** - Attached to the fourth position of the pyridine ring (para position). - Consists of a nitrogen atom bonded to two methyl groups (–N(CH₃)₂). The nitrogen has a lone pair that can contribute to resonance with the aromatic system. ### IR Spectrum Expectations In the IR spectrum of 4-Dimethylaminopyridine, common absorption peaks to expect include: - **Aromatic C-H Stretch:** Typically found around 3000-3100 cm⁻¹. - **C-N Stretch:** Peaks may appear between 1200-1350 cm⁻¹ due to the single bonds involving nitrogen. - **Aromatic Ring Vibrations:** Multiple peaks can occur between 1400-1600 cm⁻¹, associated with the C=C stretching vibrations. - **N-CH₃ Stretch:** Peaks around 2800-3000 cm⁻¹ due to C-H stretching in methyl groups. - **Other Minor Peaks:** Various peaks due to overtones and combinations in the aromatic ring region and other bending vibrations. These features allow for the identification of functional groups and confirmation of the compound's structure using infrared spectroscopy.
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