C - Chemistry – Metallurgy – 07 – D
Patent
C - Chemistry, Metallurgy
07
D
C07D 213/73 (2006.01) C07D 213/74 (2006.01)
Patent
CA 2232463
It has been found that the nitration of pyridine-2,6-diamines, which is commonly performed in a mixture of nitric acid and concentrated sulphuric acid, will give a significantly higher yield (from about 50 % up to more than 90 %) if the reaction is carried out in a mixture of nitric acid and oleum, or by otherwise providing an inherently anhydrous medium.
On a trouvé que la nitrification de pyridine-2,6-diamines, lorsqu'on la réalise de manière classique dans un mélange d'acide nitrique et d'acide sulfurique concentré, donne un rendement nettement supérieur (d'environ 50 % à plus de 90%) si l'on effectue la réaction dans un mélange d'acide nitrique et d'oléum, ou bien si on l'effectue dans un milieu intrinsèquement anhydre.
Akzo Nobel Nv
Magellan Systems International Llc
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
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