This is a patent document discussing a method for producing compounds with 1,3-dioxane and -CF2O- in high yield and high purity. The method involves reacting an aldehyde containing -CF2O- and a compound with a 1,3-bis-silyl ether structure in the presence of an acid catalyst to obtain compounds with 1,3-dioxane and -CF2O-. Additionally, it provides compounds represented by general formula (1b), which are useful as intermediates for producing compounds with 1,3-dioxane and -CF2O-.