Preheat oven to 350 degrees F. Sprinkle the pecans in the bottom of a well greased Bundt pan. Open the biscuit cans and cut the biscuits into quarters. Roll the quarters into balls. Mix white sugar and cinnamon together in a bowl. (A pie dish works best and gives more room to work.) Roll biscuit balls in the cinnamon/sugar mixture. Drop the balls evenly around the Bundt pan. Sprinkle brown sugar over the biscuit balls. Melt the butter and pour over the biscuits and brown sugar. Bake 30-40 minutes. Cool 10 minutes in pan. Carefully flip pan over onto a large plate. The Monkey Bread will fall out easily.