Question

How will you prepare cyclopentane carboxylic acid from diethyl malonate.

Answer 1

However, if cyclopentane were planar, all 10 hydrogen atoms would be eclipsed, and the torsional energy would be 10 × 4.2 = 42 kJ mole− 1.

This undesirable state of affairs can be minimized by twisting the cyclopentane ring into a lower energy, nonplanar, conformationally mobile conformation called the envelope conformation (Figure 4.8). 

Answer 2

Explanation:

Preparation of diethyl malonate

The solution is heated to 80° C and poured, with rapid stirring, into a solution of 125 g of sodium cyanide in 250 ml of water, heated to 90-95° C, and the mixture is boiled for several minutes. The reaction mixture is then cooled to room temperature and neutralized with sulfuric acid