Urea → 2-Chloro-4-fluoro-5-hydrazinylphenol

Temperature

0 °C

4-Chloro-2-fluoro-5-hydroxyaniline (10 g) was dissolved in conc. hydrochloric acid (130 ml) under heating, and the resultant mixture was cooled to 0° C. To the resulting mixture, there was dropwise added a solution of sodium nitrite (4.5 g) in water (20 ml). After completion of the addition, the mixture was further stirred at 5 to -5° C. for 1 hour, and urea was added thereto, whereby excessive sodium nitrite ion was decomposed. The resulting mixture was cooled to -30° to -25° C., and a solution of anhydrous stannous chloride (20.5 g) in conc. hydrochloric acid (40 ml) was added thereto, followed by stirring at -10° to 0° C. for 3 hours. The precipitated crystals were collected by filtration, washed with a small amount of water and dissolved in a 10% aqueous sodium hydroxide solution. The resultant solution was adjusted to pH 7 and extracted with ethyl acetate. The extract was dried and concentrated. The crystallized residue was washed with ether to obtain 1 g of 4-chloro-2-fluoro-5-hydroxyphenylhydrazine. m.p., 149°-150° C. (decomp.).

1. temperatureunder heating
2. additionAfter completion of the addition
3. temperatureThe resulting mixture was cooled to -30° to -25° C.
4. stirringby stirring at -10° to 0° C. for 3 hours
5. filtrationThe precipitated crystals were collected by filtration
6. washwashed with a small amount of water
7. dissolutiondissolved in a 10% aqueous sodium hydroxide solution
8. extractionextracted with ethyl acetate
9. customThe extract was dried
10. concentrationconcentrated
11. washThe crystallized residue was washed with ether

ORD record

ord-25178e50f1d54d4f9dc123209b533d01

Source dataset

uspto-grants-1987_06

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US04670043