Orange Pound Cake

Name: Orange Pound Cake
Ingredients: 1/2 pound (2 sticks) unsalted butter, at room temperature; 2 1/2 cups granulated sugar, divided; 4 extra-large eggs, at room temperature; 1/3 cup grated orange zest (6 oranges); 3 cups all-purpose flour; 1/2 teaspoon baking powder; 1/2 teaspoon baking soda; 1 teaspoon kosher salt; 3/4 cup freshly squeezed orange juice, divided; 3/4 cup buttermilk, at room temperature; 1 teaspoon pure vanilla extract; 1 cup confectioners' sugar, sifted; 1 1/2 tablespoons freshly squeezed orange juice