1,4-Dioxane

"1,4-Dioxane, often called dioxane because the other isomers of dioxane are rare, is a heterocyclic organic compound. It is a colorless liquid with a faint sweet odor similar to that of diethyl ether. It is classified as an ether. This colorless liquid is mainly used as a stabilizer for the solvent trichloroethane. It is an occasionally used solvent for a variety of practical applications as well as in the laboratory."

"Dioxane is relatively nonpolar but has superior dissolving power relative to diethyl ether. Diethyl ether is rather insoluble in water, whereas dioxane is miscible and in fact is hygroscopic. At standard pressure, the mixture of water and dioxane in the ratio 17.9:82.1 by mass is a positive azeotrope that boils at 87.6 °C.^[3] Dioxane is a versatile polar aprotic solvent. The oxygen atom is Lewis basic, so it is able to solvate many inorganic compounds. Because of its lower toxicity, it is substituted for tetrahydrofuran (THF) in some processes. However, it has a higher boiling point (101 °C versus 66 °C for THF), which is important when reactions are to be conducted at a higher temperature."