3,5-Bis(trifluoromethyl)phenyl isothiocyanate

Chemical Properties

Uses

• Chemical derivatization of amino-functionalized model surfaces, amino thiolate on Au, amino siloxane on Si, and polyethylene (PE) foils and films.
• Chemical derivatization of self assembled monolayers of ω-amino-4,4′-terphenyl substituted alkanethiols.
• Synthesis of ethylene-linked sulfonimidoyl-containing thioureas.
• Preparation of pyrrolidine-2-carboxylic acid-{2-[3-(3,5-bistrifluoromethylphenyl)thioureido]phenyl}-amide.

Synthesis

Synthesis of 3,5-bis(trifluoromethyl)phenyl isothiocyanate: 3,5-bis(trifluoromethyl)-4-chloroaniline (25.8g, 132.3mmol), triethylenediamine (44.46g, 396.9mmol) and 135mL toluene were added to a 250mL three-necked flask, and dissolved by stirring at room temperature. Then carbon disulfide (30.06 g, 396.9 mmol) was added dropwise within 2.0 h. After dropping, the reaction was held at 15-25C for 8-10 h. After the reaction was finished, filtration was carried out, and the filter cake was drenched with 20 mL of toluene once and dried, to obtain the yellowish powdery 3,5-bis(trifluoromethyl)-4-chloroaniline dithiocarbonate. The resulting 3-(trifluoromethyl)-4-chloroaniline dithiocarbonate was suspended in 200 mL of chloroform and cooled to -5-0 C with open stirring. Slowly add 60 mL of chloroform dissolved in solid phosgene [bis(trichloromethyl)carbonate, BTC] (12.43 g, 42.0 mmol) dropwise, after dropping, the reaction was carried out in an ice bath for 1 h, and then at room temperature for 1 h. Finally, the reaction was heated to reflux and kept warm for 1.5-2 h. After the reaction, the reaction was cooled down to room temperature, and insoluble material was removed by filtration, and the filtrate was distilled under reduced pressure to obtain 3,5-bis(trifluoromethyl)phenyl 3,5-Bis(trifluoromethyl)phenyl isothiocyanate crude product. After column chromatography (silica gel G, pure petroleum ether elution, concentrated under reduced pressure to obtain light yellow oily liquid 23.5g, purity: 99.6% (GC), bp: 248-251 , yield: 80.5%.