Azetidine is a saturated heterocyclic organic compound containing three carbon atoms and one nitrogen atom. It is a liquid at room temperature with a strong odor of ammonia and is strongly basic compared to most secondary amines.
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| Names | |||
|---|---|---|---|
| Preferred IUPAC name Azetidine[1] | |||
| Systematic IUPAC name Azacyclobutane | |||
| Other names Azetane Trimethylene imine 1,3-Propylenimine | |||
| Identifiers | |||
3D model (JSmol) | |||
| 102384 | |||
| ChEBI | |||
| ChEMBL | |||
| ChemSpider | |||
| ECHA InfoCard | 100.007.240 | ||
| EC Number |
| ||
| 986 | |||
PubChem CID | |||
| UNII | |||
CompTox Dashboard (EPA) | |||
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| Properties | |||
| C3H7N | |||
| Molar mass | 57.09 g/mol | ||
| Appearance | colorless liquid | ||
| Density | 0.847 g/cm3 at 25 °C | ||
| Boiling point | 61 to 62 °C (142 to 144 °F; 334 to 335 K) | ||
| miscible | |||
| Acidity (pKa) | 11.29 (conjugate acid; H2O)[2] | ||
| Hazards | |||
| Occupational safety and health (OHS/OSH): | |||
Main hazards | Somewhat strong base, combustible | ||
| GHS labelling: | |||
  | |||
| Danger | |||
| H225, H314 | |||
| P210, P233, P240, P241, P242, P243, P260, P264, P280, P301+P330+P331, P303+P361+P353, P304+P340, P305+P351+P338, P310, P321, P363, P370+P378, P403+P235, P405, P501 | |||
| Related compounds | |||
Other anions | Oxetane, Phosphetane, Thietane | ||
Related compounds | Aziridine, Diazetidine, Pyrrolidine, Piperidine, Azepane, Azocane, Azonane | ||
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |||
Synthesis and occurrence
Azetidines can be prepared by reduction of azetidinones (β-lactams) with lithium aluminium hydride. Even more effective is a mixture of lithium aluminium hydride and aluminium trichloride, a source of "AlClH2" and "AlCl2H".[3] Azetidine can also be produced by a multistep route from 3-amino-1-propanol.[4]
Regio- and diastereoselective synthesis of 2-arylazetidines could be performed from appropriately substituted oxiranes via ring transformation. It is controlled by Baldwin's Rules with remarkable functional group tolerance. [citation needed]
Azetidine and its derivatives are relatively rare structural motifs in natural products. They are a component of mugineic acids and penaresidins. Perhaps the most abundant azetidine containing natural product is azetidine-2-carboxylic acid - a toxic mimic of proline.[5]
See also
- Azete, the unsaturated analog