Molecular Formula | C5H5F3O3 |
Molar Mass | 170.09 |
Density | 1.283 g/mL at 25 °C (lit.) |
Boling Point | 42°C(lit.) |
Flash Point | 88°F |
Solubility | Miscible with dichloromethane. |
Vapor Presure | 12.49hPa at 25℃ |
Appearance | Liquid |
Color | Clear colorless to pale yellow |
BRN | 2087388 |
Storage Condition | Inert atmosphere,2-8°C |
Stability | Moisture Sensitive |
Refractive Index | n20/D 1.341(lit.) |
Risk Codes | R10 - Flammable R22 - Harmful if swallowed R36/37/38 - Irritating to eyes, respiratory system 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 | 3 |
HS Code | 29183000 |
Hazard Note | Corrosive |
Hazard Class | 3 |
Packing Group | III |
LogP | -0.05 |
Application | ethyl trifluoro-pyruvate is a good chemical reagent for introducing trifluoromethyl active groups, can be used as organic synthesis intermediates and pharmaceutical intermediates, mainly used in laboratory research and development process and chemical production process. |
preparation | zinc powder (6.5g, 0. 1mol), pyridine (32ml) and diethyl glycol (17.3g, 0. 125mol) was placed in a 15cm high, Mercury-sealed 250ml three-necked flask. Pump vacuum, under electromagnetic stirring, maintained at 15-22 ° C. Human CF,Br gas. About 2H increases the internal pressure of the reactor to 1 atm (equilibrium with the external pressure). The aeration rate was controlled and the reaction was maintained at 4L under normal pressure. The Orange reaction product was slowly poured into 80ml of a 20% hydrochloric acid-ICE solution and the hydrolysis was completed by stirring. The aqueous phase was extracted with diethyl ether (45ml x 6) and the combined organic phases were washed with saturated sodium chloride solution until the separated aqueous phase was neutral. After the organic phase was dried over anhydrous magnesium sulfate, the solvent was removed using a rotary Yanfa. The residue was often subjected to pressure distillation, and the B. p. 133 to 138 ° C. Fraction was collected to obtain 10.4g of the crude product. Diethyl oxalate was recovered as a solvent for 9.4 days. The crude product was redistilled, and the B. p. 134-136°C fraction was collected to obtain 8.7g of pure product. The recovered diethyl oxalate was re-distilled to obtain 8.96 pure product. 8.4g (0.057 mol) of ethylene glycol Diethyl ester actually participated in the reaction. The yield was 80.70%. |