Cope rearrangement

Explanation

### Step-by-Step Solution for Cope Rearrangement

**Step 1: Understanding the Cope Rearrangement**
The Cope rearrangement is a [1,3]-sigmatropic rearrangement involving the thermal isomerization of 1,5-hexadiene or its derivatives. It involves the migration of substituents in a molecule with a conjugated system.

**Step 2: Identify the Starting Material**
Consider a molecule with a 1,5-hexadiene structure. For example, let’s take 1,5-hexadiene (H2C=CH-CH2-CH2-CH=CH2) as our starting material.

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