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

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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.
Transcribed Image Text:**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.
**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.
Transcribed Image Text:**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.
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