Molecular Formula | C8H8BF3O3 |
Molar Mass | 219.95 |
Density | 1.36±0.1 g/cm3(Predicted) |
Melting Point | 168-172 °C |
Boling Point | 314.1±52.0 °C(Predicted) |
Flash Point | 143.775°C |
Vapor Presure | 0mmHg at 25°C |
Appearance | powder to crystal |
Color | White to Almost white |
pKa | 8.54±0.58(Predicted) |
Storage Condition | 2-8°C |
Refractive Index | 1.465 |
MDL | MFCD03095346 |
WGK Germany | 3 |
application | 4-methoxy-2-(trifluoromethyl) phenylboronic acid can be used as an intermediate in organic synthesis and a pharmaceutical intermediate for laboratory research and development and chemical production. |
preparation | 3.0g (8.85mmol) potassium phosphate heptahydrate, 1.50g (5.90mmol) pinacol borate B2(pin)2, 12mg (0.015mmol) Xphos-Pd-G2 and 4mg (0.008mmol) Xphos were sequentially added to the reaction bottle, and 6mL of ethanol was added to stir evenly, add 0.36mL (2.95mmol) 4-methoxy-2-(trifluoromethyl) chlorobenzene and react at room temperature for 1 hour. 5mL ethyl acetate was added to the reaction solution to dilute, filtered by diatomite, washed by ethyl acetate, combined filtrate, concentrated under reduced pressure to obtain crude product, separated by silica gel column chromatography, and eluted by petroleum ether-ethyl acetate to obtain 4-methoxy-2-(trifluoromethyl) phenylboronic acid pinacol ester. 4-methoxy-2-(trifluoromethyl) phenylboronic acid pinacol ester was added to the reaction bottle, and dilute HCl was added dropwise for hydrolysis. The solution first produces precipitation, and gradually disappears with the precipitation, and the pH value of the system is adjusted to 1. Drop the NaOH solution with a mass fraction of 25% to the solution to a pH value of 13, and stir for 1 h. The organic phase is extracted with 15 mL of NaOH with a mass fraction of 10%, the aqueous phase is combined, and the lye is extracted twice with 15mL of THF. Adjust the pH value of the obtained lye with dilute HCl, turbidity begins to occur, flocs slowly appear, and adjust the pH value to 5.0. The aqueous phase was extracted with 70 mLTHF, and the organic phase was spin-dried and purified to obtain 4-methoxy-2-(trifluoromethyl) phenylboronic acid. |