Trimethylene carbonate

Trimethylene

Colorless solid

Fixed

1.23 g · cm -3 ( 50 ° C)

47 ° C.

83-85 ° C ( 13 Pa )

1.4409

Attention

Template: Infobox chemical / molecular formula search available

1,3-dioxan- 2-one is a chemical compound selected from the group of saturated oxygen-containing heterocycles. It consists of a six-membered ring whose 1 - and 3-positions are formed by oxygen atoms. In the 2-position is a keto group. The connection can also be regarded as a cyclic carbonate.

Representation

The preparation of 1,3-dioxan- 2-one of the possible cyclization of organic carbonates, such as di-tert- butyl dicarbonate in the presence of base, DMAP, or diethyl carbonate in the presence of sodium methoxide at elevated temperature with 1,3-propanediol.

It can also be obtained in very good yield of oxetane under high Kohlenstoffdioxiddruck the antimony catalyst.

Properties

1,3-dioxan- 2-one, a colorless solid melting at 47 ° C at room temperature.

Use

1,3-dioxan- 2-one is a starting material for the preparation of polytrimethylene carbonate. This can be obtained by ring opening by means of a Lewis acid. Only catalytic amounts of the Lewis acid needed. For this purpose, for example, complexes of scandium may be used. Copolymers containing ethylene glycol can be obtained in this manner with zinc catalysts.

By the reaction between 1,3-dioxan- 2-one with potassium thiocyanate at 140 ° C thietane can be produced. Byproducts of potassium cyanate and carbon dioxide.