Reference: Shortridge, R. W. 4-Phenyl-m-dioxane / Journal of the American Chemical Society. - 1948. - Vol. 70, No. 2 pp. 873 [doi: 10.1021/ja01182a518]
A mixture of 220 g. of dioxane, 32 g. of 96% sulfuric acid, 30 g. of trioxane and 52 g. of styrene was allowed to stand at room temperature over a week-end. At the end of this time the reaction mixture was poured into 600 ml. of water and the organic layer was separated. The aqueous layer was extracted with three 50-ml. portions of benzene and the combined organic layer and extracts were washed with three portions of water and distilled. After removal of the benzene 64 g (78%) of 4-phenyl-m- dioxane was obtained, b. p. 94—104° at 3 mm.