反应详情

88 g of dinitro naphthalene with a content of 89.8% by weight of 1,8-dinitro naphthalene, 7.8% by weight of 1,5- and 1,3-dinitro naphthalene, less than 0.1% by weight each of 1,3,8- , 1,4,5- , 1,3,5-trinitronaphthalene, 1,7- , 1,6- and 1,4-dinitro naphthalene, α-nitro-naphthalene as well as less than 0.4% by weight of other unknown impurities, were hydrogenated, in a 0.7 liter stirrer autoclave, in 300 ml of toluene in the presence of 4 g of 1% by weight catalyst of platinum on activated charcoal, at a temperature of 50° C. and a constant hydrogen pressure of 10 bars. Hydrogenation was completed after 10 hours, the reaction solution was filtered off from the catalyst and fractionally distilled in vacuo. 49 g of 1,8-diamino naphthalene of 98-99% purity were obtained in the boiling range 140°-142° C. at a pressure of 0.2 mm Hg; this corresponds to a yield of 86% of the theory.

1. customat a temperature of 50° C.
2. filtrationthe reaction solution was filtered off from the catalyst
3. distillationfractionally distilled in vacuo