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CAS No. : | 131395-17-0 | MDL No. : | MFCD04972985 |
Formula : | C8H8F3N | Boiling Point : | No data available |
Linear Structure Formula : | - | InChI Key : | DALKOEVEKVKJQX-UHFFFAOYSA-N |
M.W : | 175.15 | Pubchem ID : | 14836858 |
Synonyms : |
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Signal Word: | Warning | Class: | |
Precautionary Statements: | P305+P351+P338 | UN#: | |
Hazard Statements: | H302-H319 | Packing Group: | |
GHS Pictogram: |
* All experimental methods are cited from the reference, please refer to the original source for details. We do not guarantee the accuracy of the content in the reference.
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With hydrazine hydrate; In ethanol; cyclohexane; water; ethyl acetate; | 4-(2,2,2-Trifluoroethyl)aniline may be prepared in the following manner: palladinized charcoal (0.17 g) containing 10% of palladium is added to a solution of 4-(2,2,2-trifluoroethyl)nitrobenzene (3.8 g) in ethanol (20 cc), and a solution of hydrazine hydrate (1.8 cc) in ethanol (10 cc) is introduced dropwise and with stirring in the course of 20 minutes; the mixture is then heated to reflux for 15 minutes and the temperature is allowed to return to about 20 C. The catalyst is filtered off, the filtrate is concentrated two-fold under reduced pressure (20 mm Hg; 2.7 kPa), water (30 cc) is added and the mixture is extracted with ethyl acetate (200 cc in total). The organic solution is dried over magnesium sulphate, filtered and evaporated under reduced pressure (20 mm Hg; 2.7 kPa), and the evaporation residue (2.7 g) is purified by chromatography on a column of silica with a mixture of cyclohexane and ethyl acetate (70:30 by volume) as eluant. 4-(2,2,2-Trifluoroethy)aniline (2.3 g) is obtained in the form of a yellow oil, which is used directly in the cyclization stage. 4-(2,2,2-Trifluoroethyl)nitrobenzene may be prepared according to the methods described by S. A. FUQUA et al., J. Org. Chem., 30, 1027 (1965), L. M. YAGUPOLSKII et al., Synthesis, (11), 932 (1980), I. KUMADAKI et al., J. Org. Chem., 53, 3637 (1988). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With triethylamine; In dichloromethane; at 20.0℃; | A mixture of 3-pyrimidin-5-yl-benzoic acid (100 mg, 0.50 mmol) SOCl2 (73 mu, 1.0 mmol) was heated under reflux for 4 h. The solvent was evaporated off under reduced pressure and the residue was dissolved in DCM (5 mL) and slowly added to a mixture of 4-(2,2,2- trifluoroethyl)aniline (105 mg, 0.60 mmol) and TEA (140 mu,, 1.0 mmol) in DCM (5 mL). The mixture was stirred at RT overnight. The solvent was evaporated off under reduced pressure and the residue was suspended in water (20 mL) filtered and dried under vacuum to afford the title compound. LC-MS (Condition 4) tR = 1.05 min, m/z = 375.8 [M+H]+; XH-NMR (400 MHz, CDC13) delta ppm 3.40 (q, J=10.76 Hz, 2 H) 7.35 (d, J=8.56 Hz, 2 H) 7.65 - 7.71 (m, 3 H) 7.80 (d, J=7.82 Hz, 1 H) 7.87 - 7.98 (m, 2 H) 8.15 (s, 1 H) 9.03 (s, 2 H) 9.28 (s, 1 H). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With triethylamine; In toluene; at 70.0℃; for 1.83333h; | To a toluene (11.4 mL) solution of <strong>[131395-17-0]4-(2,2,2-trifluoroethyl)aniline</strong> () (400 mg, 2.28 mmol) and triethylamine (764 muL, 5.48 mmol), triphosgene (352 mg, 1.19 mmol) was added, followed by stirring at room temperature for 20 minutes, and then at 70C for 1.5 hours. The resultant was cooled to room temperature, and insoluble matter was filtered with toluene. The thus obtained filtrate was concentrated under reduced pressure to obtain 1-isocyanato-4-(2,2,2-trifluoroethyl)benzene as a crude product in the form of a light brown oil. |
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