P-Dioxanone
Chemical compound
From Wikipedia, the free encyclopedia
p-Dioxanone (1,4-dioxan-2-one) is the lactone of 2-(2-hydroxyethoxy)acetic acid. It is a monomer that can undergo ring-opening polymerization to give polydioxanone, a biodegradable implant material.[1] It is isomeric to trimethylene carbonate (1,3-dioxan-2-one).
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| Names | |
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| Preferred IUPAC name
1,4-Dioxan-2-one | |
| Other names
para-Dioxanone | |
| Identifiers | |
3D model (JSmol) |
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| ChemSpider | |
| ECHA InfoCard | 100.130.057 |
PubChem CID |
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| UNII | |
CompTox Dashboard (EPA) |
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| Properties | |
| C4H6O3 | |
| Molar mass | 102.089 g·mol−1 |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Preparation
The common synthetic process for p-dioxanone is continuous gas-phase dehydrogenation of diethylene glycol on a copper or copper chromite catalyst at 280 °C.
This gives yields of up to 86%. Removal of excess diethylene glycol is crucial to the stability of the product as a monomer.[2] Further purification with recrystallization, vacuum distillation,[3] or melt crystallization[2] allows purities of >99.5% to be achieved.
Properties
Pure p-dioxanone is a white crystalline solid with a melting point of 28 °C.[4]
Uses
The oxidation of p-dioxanone with nitric acid or dinitrogen tetroxide gives diglycolic acid at 75% yield.[5]
p-Dioxanone can undergo ring-opening polymerization catalyzed by organic compounds of tin, such as tin(II) octoate[6] or dibutyltin dilaurate, or by basic alkoxides such as aluminium isopropoxide. This affords polydioxanone, a biodegradable, semicrystalline and thermally labile polymer with uses in industry and medicine.[7] Depolymerization back to the monomer is triggered at 100 °C.
