pineapple velvet upside~down bundt cake

Ingredients

• 2 cups baking flour
• 1 stick butter
• 1 3/4 cups sugar
• 2 large egg whites
• 1/2 cup pineapple juice
• 1 can crushed pineapples [drained]
• 1 can pineapple slices
• 2 teaspoons baking powder
• 2 large eggs slightly beaten
• 1/4 teaspoon salt
• 1/4 cup oil
• BATTER 2
• 2 sticks butter
• 1 3/4 cups sugar
• 2 1/2 cups cake flour
• 1 cup all purpose flour
• 1 1/4 teaspoons salt
• 2 large eggs
• 1 large egg white
• 1 cup buttermilk
• 1 1/2 teaspoons vanilla extract
• 1 teaspoon baking soda
• 1 1/2 teaspoons vinegar
• 4 tablespoons cocoa [heaping]
• 1 1/2 ounces red color