H3CO Predict the splitting pattern expected for the circled proton in the structure below. Consider complex coupling and long-range coupling. H H H A) d B) dd C) dt D) ddt E) dq
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).
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IR Spectroscopy
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![**Predict the splitting pattern expected for the circled proton in the structure below. Consider complex coupling and long-range coupling.**
**Molecular Structure:**
- The molecule is a compound with a methoxy group (H₃CO) attached to a carbonyl group (C=O), which is part of a simple alkene structure.
- The circled proton is one of the protons on the carbon adjacent to the carbonyl group and the alkene bond.
**Options for Splitting Pattern:**
A) d
B) dd
C) dt
D) ddt
E) dq
**Explanation:**
1. **Molecular Geometry:**
- The structure suggests a potential for splitting due to the interaction of the circled proton with nearby hydrogen atoms, considering both complex and long-range coupling effects.
2. **Splitting Considerations:**
- The nearby protons can cause the circled proton to split into multiple peaks in an NMR spectrum.
- This involves understanding the J-couplings between the circled proton and its neighboring protons, potentially resulting in a complex splitting pattern.
3. **Answer Choices:**
- Each option represents a different possible splitting pattern:
- d: doublet
- dd: doublet of doublets
- dt: doublet of triplets
- ddt: doublet of doublets of triplets
- dq: doublet of quartets
Review the molecular structure carefully and apply your knowledge of NMR spectroscopy, considering both long-range and complex coupling, to identify the appropriate splitting pattern for the circled proton.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F9d612664-29d3-4f25-8110-f0e16c781315%2F57d433e6-8c18-423c-b6eb-aeb16a554f19%2Fe8vvgjh_processed.png&w=3840&q=75)
![**Predict the splitting pattern expected for the circled proton in the structure below. Consider complex coupling and long-range coupling.**
**Structure Description:**
The structure shown is a molecular diagram featuring a benzene ring connected to an extended carbon chain. Notably, there is a carbonyl group (C=O) at the end of the chain. The circled proton is on the carbon adjacent to the carbonyl carbon.
**Splitting Pattern Options:**
A) d
B) dd
C) dt
D) ddt
E) dq
**Explanation:**
- **A) d:** Doublet
- **B) dd:** Doublet of doublets
- **C) dt:** Doublet of triplets
- **D) ddt:** Doublet of doublet of triplets
- **E) dq:** Doublet of quartets
**Instruction:** Analyze the structural context and coupling interactions, considering both neighboring protons and potential long-range couplings, to determine the correct splitting pattern for the highlighted proton's NMR signal.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F9d612664-29d3-4f25-8110-f0e16c781315%2F57d433e6-8c18-423c-b6eb-aeb16a554f19%2Flbj2un_processed.png&w=3840&q=75)
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