Intramolecular ring closure to form cyclobutane is unfavourable, how would you synthesise cyclobutane from open-chain compounds?

Explanation

To synthesize cyclobutane from open-chain compounds, we can utilize electrocyclic reactions. Here’s a step-by-step breakdown of the synthesis process:

### Step 1: Understanding the Structure of Cyclobutane
Cyclobutane is a cyclic alkane with four carbon atoms arranged in a ring. Its molecular formula is C4H8.

### Step 2: Choose Starting Materials
We can use ethene (C2H4) as our starting material. We will need two molecules of ethene to form cyclobutane.

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