Double Coincidence of Wants is an essential feature in a barter system, where goods are directly exchanged without the use of money. However, in an economy using money as a medium of exchange, eliminates this by providing the crucial intermediate step.
For example, it is not necessary for a shoemaker to look for a farmer who will buy shoes made by him and at the same time, sell rice to him. All he has to do is to find a buyer for his shoes, who will pay him money for them.
With this money he can purchase rice or any other commodity available in the market.