Pour melted butter into a well greased 9x13 inch cake pan. drain pineapple reserving 1/4 of juice. Arrange pineapple slices in prepared pan; place a pecan half in the center of each pineapple. Combine apricot preserves with 1/4 cup of pineapple juice; spoon over pineapple slices. Prepare cake batter according to package directions; pour over cake.
Bake 350F for 40-50 minutes. Immediately invert onto a large serving platter.