反应详情

Finely ground 2-(4-aminophenyl) propionitrile (73 g., 0.5 mole) was suspended in concentrated hydrochloric acid (125 ml.). The stirred suspension was diazotised at 0°-5° C. by the dropwise addition of a solution of sodium nitrite (36.23 g., 0.525 mole) in water (60 ml.) during 1- 2 hours. The almost clear solution was stirred for a further 20 minutes at 5°-10° C., then poured into a stirred, boiling solution of concentrated sulphuric acid (250 ml.) in water (2.5 l.). After 6 minutes it was cooled in an ice-bath, then extracted with ether (×4). The combined ether extracts were extracted with 2N-sodium hydroxide (×6). The combined alkaline extracts were cooled in ice-bath, acidified with concentrated hydrochloric acid and extracted with ether (×3). The combined ether extracts were washed with saturated sodium chloride solution (×3), dried (Na2SO4) and evaporated to leave a dark brown oil (66.7 g.) which on distillation gave 2-(4-hydroxyphenyl) propionitrile (59.58 g.), b.p. 112°-122° C./0.125 m.m., m.p. 41°-46° C.

1. additionpoured into a stirred
2. temperatureAfter 6 minutes it was cooled in an ice-bath
3. extractionextracted with ether (×4)
4. extractionThe combined ether extracts were extracted with 2N-sodium hydroxide (×6)
5. temperatureThe combined alkaline extracts were cooled in ice-bath
6. extractionextracted with ether (×3)
7. washThe combined ether extracts were washed with saturated sodium chloride solution (×3)
8. dry with materialdried (Na2SO4)
9. customevaporated
10. customto leave a dark brown oil (66.7 g.) which
11. distillationon distillation