反应详情

A solution of diphenylborinic anhydride (5.0 g; 0.014 mole) in tetrahydrofuran (20 ml) was added to a solution of 2-(2′-hydroxyphenyl)benzoxazole (3.1 g; 0.014 mole) in tetrahydrofuran (10 ml). The reaction mixture was refluxed under nitrogen for 2 h and allowed to cool to room temperature, then kept in the refrigerator for 18 h. The product was filtered off under suction, washed with methanol and dried under vacuum at 80° C. for 6 h. Yield 4.4 g (84%). The product was further purified by sublimation (85%). M.p 195° C. (DSC, onset); Tg 59° C. Elemental analysis:

1. temperatureThe reaction mixture was refluxed under nitrogen for 2 h
2. filtrationThe product was filtered off under suction
3. washwashed with methanol
4. customdried under vacuum at 80° C. for 6 h
5. customThe product was further purified by sublimation (85%)
6. customM.p 195° C. (DSC, onset)