s-Trioxane
Title: s-Trioxane
CAS Registry Number: 110-88-3
CAS Name: 1,3,5-Trioxane
Additional Names: 1,3,5-trioxacyclohexane; metaformaldehyde; trioxymethylene
Molecular Formula: C3H6O3
Molecular Weight: 90.08
Percent Composition: C 40.00%, H 6.71%, O 53.28%
Literature References: Review: Walker, Carlisle, Chem. Eng. News 21, 1250 (1943).
Properties: Stable, cyclic trimer of formaldehyde possessing characteristic chloroform-like odor. Crystalline solid, mp 64°, bp759 114.5° without dec. Sublimes readily. Easily sol in water (17.2 g/100 ml at 18°, 21.1 g/100 ml at 25°), alcohols, ketones, ether, acetone, chlorinated and aromatic hydrocarbons, and other organic solvents. Only slightly sol in pentane, petroleum ether, and lower paraffins. d65 1.17. Flash pt 45°C. On distillation with water, forms an azeotrope boiling at 91.4° containing approx 70% trioxane by wt. Slowly depolymerized by strong acids in aq soln, but inert to alkalies. In non-aqueous systems, readily converted to monomeric formaldehyde by small concentrations of strong acids at a rate determined by the acid concentration.
Melting point: mp 64°
Boiling point: bp759 114.5°
Flash point: Flash pt 45°C
Density: d65 1.17

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