反应详情

A quantity of 222.45 grams (2.10 moles) of cyanogen bromide was added to a reactor containing 350 milliliters of stirred acetone under a nitrogen atmosphere. The cyanogen bromide-acetone solution was cooled to -5° C., then 228.30 grams (1.00 mole) of Bisphenol A dissolved in 700 milliliters of chilled acetone was added to the reactor. The stirred solution was allowed to equilibrate at -5° C., then 203.39 grams (2.01 moles) of triethylamine was added to the reactor over a 25-minute (1500 s) period and so as to maintain the reaction temperature at -5° to 0° C. After completion of the triethylamine addition, the reaction temperature was maintained at -6° to 7° C. for an additional 45 minutes (2700 s), followed by addition of the reaction product to chilled water (1 gallon, 3.78 liters) with agitation. After 20 minutes (1200 s), the water and product mixture was added to a separatory funnel and the resulting slurry of crystals was filtered. The recovered crystalline product was dissolved in methylene chloride (400 milliliters), washed with 5 percent hydrochloric acid (500 milliliters), washed with water (1000 milliliters) and then dried over anhydrous sodium sulfate. The dry methylene chloride solution was filtered and solvent removed by rotary evaporation under vacuum. Bisphenol A dicyanate (245.3 grams) was recovered in 88.1 percent yield as a light tan colored crystalline solid. Infra-red spectrophotometric analysis confirmed the product structure.

1. additionwas added to the reactor
2. customto equilibrate at -5° C.
3. temperatureso as to maintain the reaction temperature at -5° to 0° C
4. temperaturethe reaction temperature was maintained at -6° to 7° C. for an additional 45 minutes (2700 s)
5. additionfollowed by addition of the reaction product
6. filtrationthe resulting slurry of crystals was filtered
7. dissolutionThe recovered crystalline product was dissolved in methylene chloride (400 milliliters)
8. washwashed with 5 percent hydrochloric acid (500 milliliters)
9. washwashed with water (1000 milliliters)
10. dry with materialdried over anhydrous sodium sulfate
11. filtrationThe dry methylene chloride solution was filtered
12. customsolvent removed by rotary evaporation under vacuum
13. customBisphenol A dicyanate (245.3 grams) was recovered in 88.1 percent yield as a light tan colored crystalline solid