Stereoselective synthesis of a series of 1,3-dioxan-4-ylmethanes 1−9 has been achieved by use of solely substrate-based asymmetric induction. The simple C2-symmetric bis(dioxanyl)methane 1 has a greater than 99% conformational preference at the two inter-ring bonds for the conformation 1a. The homologous structures 3−9 contain up to five dioxanylmethane units, maintaining a high conformational preference