Summary for n=n aromatic cleavage reaction Discussion
N=N aromatic cleavage reaction is the issue here: Yoga Priastomo asked how to convert an aromatic azo compound to a nitro-aromatic using 98% sulfuric acid and 65% nitric acid, because the mixture heated sharply when sulfuric acid was added and then splashed/spread out when nitric acid was introduced. No direct solution was posted in the excerpt, but the problem described is a strong exotherm and likely unsafe addition sequence. The practical takeaway is to control heat and addition rate very carefully, since adding nitric acid to a hot concentrated acid mixture can cause violent splattering. The thread excerpt does not include a named responder or a confirmed optimized procedure, so the advice remains cautious and general.
Q. Hello everyone. I have a bit problem in my research. I will do cleavage of N=N aromatic to be Nitro-aromatic using sulfuric acid 98% and Nitric Acid 65%. When I add sulfuric acid concentrated in a mixture (reactants), temperature suddenly increase up to 90 °C (it’s not problem). However, when I add nitric acid, the mixture was suddenly spread out. I did this method twice.
Have you some idea how to make this reaction occur smoothly?
Yoga Priastomo
researcher – Indonesia
May 7, 2018