Problem of fluorine removal during salt cracking of aniline-based fluoroboric acid diazotized salts; filtration of insolutes after adding sodium nitrosonate
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I have been working on the diazotization of aniline derivatives with fluoroboric acids followed by salt hydrolysis to introduce fluorine, and I have a few questions for everyone. 4. I saw some people say that if insoluble substances form after adding sodium nitrite, they can be removed by filtration. Can it be filtered out in this case? What are these insoluble substances? Coupling? Is there still some of the 1-diazonium salt that remains undissolved? If it is a partially insoluble chloro-diazonium salt, will it dissolve to become a fluoroboric acid-diazonium salt when fluoroboric acid is added in the next step? Or do the chloro-diazonium salts and fluoroboronic acid-diazonium salts precipitate together?
Filtering it out should be possible, and it’s best to remove it before the next step. This substance is generally of the azo type.