Sodium Hydroxide → 2-Methoxymethylphenylhydrazine

Temperatur

-10 °C

6.86 g (50 m moles) of 2-methoxymethylaniline was dissolved in 50 ml of concentrated hydrochloric acid. The solution was cooled to −10° C. Thereto was dropwise added a solution of sodium nitrite (4.14 g, 60 m moles) dissolved in water (50 ml) while a temperature of −10° C. to 0° C. was being kept. Then, a solution of 44.6 g (235 m moles) of stannous chloride dissolved in concentrated hydrochloric acid (50 ml) was dropwise added at the above temperature in 1 hour. After the completion of the dropwise addition, stirring was conducted with a gradual temperature increase to about 20° C. Then, a 10% aqueous sodium hydroxide solution was dropped to obtain a pH of 14, after which extraction with toluene was conducted. The toluene layer was washed with water and concentrated under reduced pressure using a rotary evaporator to obtain 5.40 g (35.5 m moles) of liquid 2-methoxymethylphenylhydrazine. Yield: 71%.

1. additionwas dropwise added at the above temperature in 1 hour
2. additionAfter the completion of the dropwise addition
3. temperatureincrease to about 20° C
4. customto obtain a pH of 14
5. extractionafter which extraction with toluene
6. washThe toluene layer was washed with water
7. concentrationconcentrated under reduced pressure
8. customa rotary evaporator

ORD-Eintrag

ord-bff5a41a01c241e79c1ed5d9deae2027

Quelldatensatz

uspto-grants-2007_09

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US07271263B2