Why is the IR of 4-Methylphenyl 4-bromobenzoate and not 4-bromobenzoic acid? In the IR does it have a presence of both and is there some 4-Dimethylaminopyridine present in the IR? T% 100 Br 90 ob OH 4-bromobenzoic acid 3500 3087 3033 3000 Br 2921 2500 cm-1 1727 olo q N N 4-Methylphenyl 4-bromobenzoate 2000 4-Dimethylaminopyridine
Analyzing Infrared Spectra
The electromagnetic radiation or frequency is classified into radio-waves, micro-waves, infrared, visible, ultraviolet, X-rays and gamma rays. The infrared spectra emission refers to the portion between the visible and the microwave areas of electromagnetic spectrum. This spectral area is usually divided into three parts, near infrared (14,290 – 4000 cm-1), mid infrared (4000 – 400 cm-1), and far infrared (700 – 200 cm-1), respectively. The number set is the number of the wave (cm-1).
IR Spectrum Of Cyclohexanone
It is the analysis of the structure of cyclohexaone using IR data interpretation.
IR Spectrum Of Anisole
Interpretation of anisole using IR spectrum obtained from IR analysis.
IR Spectroscopy
Infrared (IR) or vibrational spectroscopy is a method used for analyzing the particle's vibratory transformations. This is one of the very popular spectroscopic approaches employed by inorganic as well as organic laboratories because it is helpful in evaluating and distinguishing the frameworks of the molecules. The infra-red spectroscopy process or procedure is carried out using a tool called an infrared spectrometer to obtain an infrared spectral (or spectrophotometer).
![**Infrared Spectroscopy Analysis:**
**Question:**
Why is the IR of 4-Methylphenyl 4-bromobenzoate and not 4-bromobenzoic acid? In the IR, does it have a presence of both, and is there some 4-Dimethylaminopyridine present?
**Infrared Spectrum Analysis:**
The infrared (IR) spectrum presented features a transmittance plot with key peaks identified at specific wavenumbers (cm<sup>-1</sup>).
- **Peak at 3087 cm<sup>-1</sup>:** This peak typically corresponds to aromatic C-H stretching, indicating the presence of aromatic rings.
- **Peak at 3033 cm<sup>-1</sup>:** Another characteristic peak for aromatic C-H stretching.
- **Peak at 2921 cm<sup>-1</sup>:** Often associated with aliphatic C-H stretching, which may suggest the presence of aliphatic groups.
- **Peak at 1727 cm<sup>-1</sup>:** This strong peak is indicative of C=O (carbonyl) stretching, confirming the presence of an ester or carboxylic acid group distinctive of 4-Methylphenyl 4-bromobenzoate.
**Molecular Structures:**
1. **4-bromobenzoic acid:** Features a bromine atom attached to a benzene ring with a carboxylic acid group (-COOH).
2. **4-Methylphenyl 4-bromobenzoate:** Includes an ester linkage with a methylphenyl group attached to a benzene ring that has a bromine atom.
3. **4-Dimethylaminopyridine (DMAP):** Contains a pyridine ring with a dimethylamino group.
**Interpretation:**
The spectra displays features more consistent with 4-Methylphenyl 4-bromobenzoate rather than 4-bromobenzoic acid, as evidenced by the ester C=O stretching. There is no clear indication of signals that are characteristic of 4-Dimethylaminopyridine, such as specific N-H or C-N stretches. Thus, it's unlikely that 4-Dimethylaminopyridine is present in significant amounts in this sample based on this IR analysis.
This analysis serves as an example of how IR spectroscopy can be used to identify functional groups and differentiate between similar](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fbcc06ddf-b279-4b52-8244-b7b88eac7d08%2Ff691917f-efd8-4c3f-84ab-668eae66552e%2Fvi999r_processed.png&w=3840&q=75)
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