Tetraethyl orthocarbonate Tetraethyl orthocarbonate
Structural formula
| Business number | 01MQ |
|---|---|
| Molecular formula | C9H20O4 |
| Molecular weight | 192.25 |
| label |
Tetraethoxymethane, Tetraethoxymethane, Tetraethoxymethane, Ethylorthocarbonate, Orthocarbonic acid tetraethyl ester, Triethoxymethoxyethane, Elemental organic compounds |
Numbering system
CAS number:78-09-1
MDL number:MFCD00009221
EINECS number:201-082-2
RTECS number:None
BRN number:1747401
PubChem number:24886851
Physical property data
1. Properties: Colorless ether-like odor liquid
2. Density (g/mL, 25/4℃): 0.9197
3. Relative density (20℃ , 4℃): 0.9186
4. Melting point (ºC): 160
5. Boiling point (ºC, normal pressure): 159
6. Refraction at room temperature Index (n20): 1.3930
7. Refractive index: 1.3935
8. Flash point (ºC): -24°C (52°C)
9. Gas phase standard combustion heat (enthalpy) (kJ·mol-1): -5521.6
10. Gas phase standard claimed heat (enthalpy) ( kJ·mol-1): -878.2
11. Liquid phase standard heat of combustion (enthalpy) (kJ·mol-1): -5481.0
12. Liquid phase standard claims heat (enthalpy) (kJ·mol-1): -918.8
13. Heat of combustion (KJ/mol) : Undetermined
14. Critical temperature (ºC): Undetermined
15. Critical pressure (KPa): Undetermined
16. Oil and water (octanol /water) logarithmic value of the distribution coefficient: Undetermined
17. Explosion upper limit (%, V/V): Undetermined
18. Explosion lower limit (%, V/V) : Undetermined
19. Solubility: Insoluble in water, easily soluble in ethanol and ether
Toxicological data
None yet
Ecological data
None yet
Molecular structure data
1. Molar refractive index: 50.69
2. Molar volume (cm3/mol): 202.5
3. Isotonic specific volume (90.2K ): 463.9
4. Surface tension (dyne/cm): 27.5
5. Polarizability (10-24cm3): 20.09 p>
Calculate chemical data
None yet
Properties and stability
1. Also known as tetraethoxymethane. Colorless ether-like odor liquid. Boiling point 159℃. Relative density 0.9197 g/ml, flash point -24°C (52°C). Refractive index 1.3935. Easily soluble in ethanol and ether. Reacts with ammonia to form guanidine and ethanol; reacts with Grignard reagent (RMgX) to form orthoester [RC(OC2H5)3].
2.This product has low toxicity and has a strong irritating effect on the respiratory tract and eyes. The maximum allowable concentration in the air850mg/m3. To prevent dust from flying at the production site, operators should wear protective equipment.
Storage method
1. This product should be sealed and stored in a cool and dark place.
2. Sealed and packaged in glass bottles and reinforced with wooden boxes. Stored in a dangerous goods warehouse and transported in accordance with Railway Danger Regulations No. 84064.
Synthesis method
1. Prepared by reacting sodium ethoxide and chloropicrin. Its homolog propyl orthocarbon-ate, C(OC3H7)4], has a boiling point of 224°C; orthobutyl carbonate [butyl orthocar-bonate, C(C4H9)4], has a boiling point of 245°C.
Purpose
1. Mainly used for the synthesis of pharmaceutical intermediates and adhesives.
2.Protection of 1,2-diol
