The originalacetic acidethyl ester three
Triethyl orthoacetate
CAS: 78-39-7
Molecular Formula: C8H18O3
The originalacetic acidethyl ester three - Names and Identifiers
The originalacetic acidethyl ester three - Physico-chemical Properties
| Molecular Formula | C8H18O3 |
| Molar Mass | 162.23 |
| Density | 0.885 g/mL at 25 °C (lit.) |
| Boling Point | 142 °C (lit.) |
| Flash Point | 97°F |
| Water Solubility | SLIGHTLY SOLUBLE |
| Vapor Presure | 3.4 hPa (20 °C) |
| Appearance | Liquid |
| Color | Clear colorless to slightly yellow |
| BRN | 506201 |
| Storage Condition | Store below +30°C. |
| Sensitive | Moisture Sensitive |
| Explosive Limit | 0.9-7.0%(V) |
| Refractive Index | n20/D 1.396(lit.) |
| Physical and Chemical Properties |
|
| Use | For the preparation of trans trisubstituted alkene and chiral Allene and other vinyl preparations and dyes, raw materials for the pharmaceutical industry |
The originalacetic acidethyl ester three - Risk and Safety
| Hazard Symbols | Xi - Irritant |
| Risk Codes | R10 - Flammable R36/38 - Irritating to eyes and skin. |
| Safety Description | S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S37/39 - Wear suitable gloves and eye/face protection S16 - Keep away from sources of ignition. |
| UN IDs | UN 3272 3/PG 3 |
| WGK Germany | 1 |
| RTECS | KJ4075000 |
| TSCA | Yes |
| HS Code | 29159080 |
| Hazard Class | 3 |
| Packing Group | III |
The originalacetic acidethyl ester three - Reference Information
| LogP | 2.6 at 20℃ |
| NIST chemical information | information provided by: webbook.nist.gov (external link) |
| EPA chemical substance information | information provided by: ofmpeb.epa.gov (external link) |
| Use | triethyl ortho-acetate is an important intermediate in the synthesis of ethyl dichloro-Chrysanthemum. It is used for the preparation of Alene preparations such as trans-trisubstituted alkene and chiral allene, and the raw materials of dyes and pharmaceutical industry It is an intermediate for the synthesis of medicines, dyes and pesticides. |
| production method | triethyl ortho-acetate and trimethyl ortho-acetate are prepared by pumping acetonitrile, toluene and anhydrous ethanol into a salt-forming pot, cooling to -10 ~-5 ℃, feeding the amount of dry hydrogen chloride, keeping the salt formation temperature -5~0 ℃, when the hydrogen chloride is finished, the reaction at 0 ℃ for 1H, then keep the temperature at 0~20 ℃ for 0.5h, move to alcoholysis Pan, carry out salt formation reaction, keep the temperature at 20~25 ℃, react with stirring, about 12h, the intermediate imino ether hydrochloride is gradually precipitated out, cooled to 0~5 ℃, then the pre-cooled anhydrous ethanol and Thymol blue indicator are added, and the stirring is accelerated. At the same time, ammonia gas is slowly introduced into the alcoholysis material for neutralization, observe the color change of the indicator until it changes from red to yellow without turning red, pH = 3.6, At this time, the aeration is finished, and the alcoholysis reaction is carried out at 40 ℃ for about 8~9H. The material is cooled, ammonium chloride is removed by filtration through a centrifuge, and the filtrate is pumped to the neutralization pot, and 17% sodium ethoxide ethanol solution is added, adjust the solution pH = 8~9, the alcoholate is pumped into the distillation pot atmospheric distillation, control the temperature at 75 deg C to recover ethanol, the residual liquid is cooled and filtered to remove acetamide, sodium chloride solids, after washing with 1% Na2CO3 solution and layering, the oil layer is distilled under reduced pressure, toluene is distilled out first, and then the 88-98 ℃/0.07MPa fraction is collected as triethyl orthoacetate. Reaction equation: CH3CN C2H5OH[HCl]→ CH3C(OCH5)3 NH4Cl |
| autoignition temperature | 455°C |
Last Update：2024-04-09 19:05:15
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