Dioxane

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Related to Dioxan: P-dioxane

Dioxane

 

diethylene dioxide, a cyclic ether. It is a colorless, mobile liquid with an ethereal odor, Melting point, 11.8°C; boiling point, 101.3°C; density, 1.03375 g/cm3; index of refraction n2DO, 1.42241; flash point, 5°C (in a closed cup); explosion limits in air, 1.97-22.5 percent by volume. It is miscible with water, alcohol, and ether; it forms an azeotrope with water (boiling point, 87.8°C; 81.6 percent dioxane).

In industry, dioxane is made from ethylene glycol (1), Chlorex (2), or ethylene oxide (3):

In many processes, dioxane is used as a good solvent for such substances as cellulose acetate, petroleum and plant oils, and dyes. It is comparatively toxic. The highest permissible concentration of dioxane in air is 0.01 mg per liter.

References in periodicals archive ?
In the next step, we replaced aromatic aldehydes with isatin, and spirooxindoles obtained as the products of the reaction after a short refluxing time in dioxan in the presence of DABCO as a catalyst.
To a mixture of aryl aldehyde 1 (0.003 mol), dimedone 2 (0.003 mol) and malononitrile 3 (0.0033 mol) in dioxan was added DABCO (10 mol%) as a catalyst under stirring at room temperature.
For example, S[O.sub.3] gives the S[O.sub.3]-O[(C[H.sub.2]).sub.2]0-S[O.sub.3] complex in the reaction with dioxan. The reaction with trimethyl phosphate [[(MeO).sub.3]PO] and triethyl phosphate [[(EtO).sub.3]PO] gives adducts soluble in dichloroethane, which are also good sulfonating agents.
Sulfonating compounds such as S[O.sub.3], [H.sub.2]S[O.sub.4], ClS[O.sub.3]H, acetyl sulfate, [C.sub.12]-lauryl sulfate, [C.sub.18]-stearyl sulfate, and complexes of S[O.sub.3] with alkylphosphates and dioxan, were commonly used for sulfonation of various polymers, namely polystyrene (PS).
These calculations aimed at determination of relative thermodynamic stability of cyclic acetals of different types-dioxepanes, dioxanes, and dioxolanes.