反应详情

23.2 g of 5-nitro-N-methylaniline-2-sulfonic acid were added to 300 g of water. The pH was then adjusted to from 5. 0 to 5.5 with sodium hydroxide solution, 2 g of Raney nickel were added and hydrogenation was carried out under atmospheric pressure at 30° C. After hydrogen uptake had ceased, the catalyst was filtered off, the pH of the filtrate was adjusted to 0.5 to 1.0 with hydrochloric acid, and the precipitated 3-(N-methylamino)aniline-4sulfonic acid was isolated by filtration.

1. customwas carried out under atmospheric pressure at 30° C
2. filtrationthe catalyst was filtered off