a. b. ·N· CH 3 Br. 1. PhMg Br 2. diluted H+ -O excews СПЗ Сигон Catalyst ficl

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Chapter1: Chemical Foundations
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Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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### Question 3: Identify the Major Organic Product

**a. Reaction Scheme:**

1. **Reactant:** 
   - A six-membered ring with a nitrogen atom, featuring a carbonyl group (C=O) and a methyl group (CH₃) attached to the nitrogen.
   
2. **Reagents:**
   - Step 1: Phenylmagnesium bromide (PhMgBr)
   - Step 2: Dilute H⁺ (acidic conditions)

**b. Reaction Scheme:**

1. **Reactant:** 
   - A bicyclic compound with a bromine atom (Br) attached to the five-membered ring and a carbonyl group (C=O) on the six-membered ring.

2. **Reagents:**
   - Excess ethanol (CH₃CH₂OH)
   - Catalyst: HCl

**Explanation:**

- In part (a), the reactant undergoes a two-step reaction involving a Grignard reagent (PhMgBr) followed by acidic work-up. This typically results in the addition of the phenyl group to the carbonyl carbon, leading to the formation of an alcohol.

- In part (b), the reaction involves the use of excess ethanol and HCl, likely yielding an esterification or substitution reaction that replaces the bromine atom with an ethoxy group from ethanol.

These reactions illustrate fundamental concepts in organic synthesis, such as nucleophilic addition and substitution.
Transcribed Image Text:### Question 3: Identify the Major Organic Product **a. Reaction Scheme:** 1. **Reactant:** - A six-membered ring with a nitrogen atom, featuring a carbonyl group (C=O) and a methyl group (CH₃) attached to the nitrogen. 2. **Reagents:** - Step 1: Phenylmagnesium bromide (PhMgBr) - Step 2: Dilute H⁺ (acidic conditions) **b. Reaction Scheme:** 1. **Reactant:** - A bicyclic compound with a bromine atom (Br) attached to the five-membered ring and a carbonyl group (C=O) on the six-membered ring. 2. **Reagents:** - Excess ethanol (CH₃CH₂OH) - Catalyst: HCl **Explanation:** - In part (a), the reactant undergoes a two-step reaction involving a Grignard reagent (PhMgBr) followed by acidic work-up. This typically results in the addition of the phenyl group to the carbonyl carbon, leading to the formation of an alcohol. - In part (b), the reaction involves the use of excess ethanol and HCl, likely yielding an esterification or substitution reaction that replaces the bromine atom with an ethoxy group from ethanol. These reactions illustrate fundamental concepts in organic synthesis, such as nucleophilic addition and substitution.
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