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N=N aromatic cleavage reaction

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

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