After cooling and 2,6-Lutidine addition, triflic anhydride is slowly added at -30° C. Salts are removed by filtration.
Most preferred are those derived from the amines 2-ethyl-4-methylimidazole, 4-methylimidazole, 4-ethylpyridine, 4-t-butylpyridine and 3,4-lutidine by quaternisation with a methyl group.
The compounds of formulae (I) and (II) in which R?1 and R2¿ are both methyl groups can be obtained by subjecting 3,5-lutidine to the effect of a strong reducing agent, for example molten sodium.
The present invention is a process for the manufacture of 3,5-lutidine and 3-picoline from 2-methyl-1,5-pentanediamine by vapor phase reaction with hydrogen at about 400-500 °C over an oxide catalyst.
The above reaction is performed in a gas phase with a temperature range of 400-450°C. The compound formed consists of pyridine, picoline or simple methylated pyridines, and lutidine.
Requêtes fréquentes français :1-200, -1k, -2k, -3k, -4k, -5k, -7k, -10k, -20k, -40k, -100k, -200k, -500k, -1000k,
Requêtes fréquentes anglais :1-200, -1k, -2k, -3k, -4k, -5k, -7k, -10k, -20k, -40k, -100k, -200k, -500k, -1000k,
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