Nitric Acid → 3-Methyl-5-nitro-2-pyridone

Temperatur

30 °C

A solution of (3-methylpyridin-2-yl)amine (10 g, 90 mmol) in 50 ml of concentrated sulfuric acid was cooled to 5° C. in ice-salt bath. A mixture of 7 ml each of concentrated sulfuric acid and concentrated nitric acid was added slowly with stirring while maintaining the reaction temperature below 10° C. This mixture was then allowed to warm to 30° C. overnight. The solution was stirred rapidly while 7 ml of concentrated nitric acid was added at such a rate as to keep the temperature below 40° C. Approximately 10 ml of the solution was then poured into 20 ml of water and heated to 100° C.; large quantities of gas were evolved. When gas evolution ceased, the remainder of the nitrating mixture was added in 10 ml portions with heating. When the last of the nitrating mixture had been added, the solution was cooled rapidly by placing the flask in an ice bath and by adding ice directly to the solution. The light brown precipitate was filtered and dried to afford 5.0 g (35%) of the title compound.

1. additionwas added slowly
2. temperaturewhile maintaining the reaction temperature below 10° C
3. additionwas added at such a rate as
4. customthe temperature below 40° C
5. temperatureheated to 100° C.
6. additionthe remainder of the nitrating mixture was added in 10 ml portions
7. temperaturewith heating
8. additionWhen the last of the nitrating mixture had been added
9. temperaturethe solution was cooled rapidly
10. additionby adding ice directly to the solution
11. filtrationThe light brown precipitate was filtered
12. customdried

ORD-Eintrag

ord-d44484b6abd342f4b4a40f3ae0c0f490

Quelldatensatz

uspto-grants-2011_03

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US07897607B2