Issues related to the fluorination of aniline-based fluoroboric acid diazotized salts during cracking; why is the system cloudy at low temperatures?
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I have been working on the diazotization of aniline derivatives with fluoroboric acids followed by salt hydrolysis for fluorine introduction, and I have a few questions for everyone. 3. At temperatures between -10 degrees and -20 degrees, after adding sodium nitrite and nitrogenating the mixture, it should be clear and transparent; why is mine so cloudy? Is the system brick red? No layering is visible in the added methylbenzene as well. I saw a similar reaction mentioned in relation to “Zhengfa Kuaijia”. Zhengfa means first forming a salt and then adding sodium nitrite. What does “Kuaijia” mean? Add sodium nitrito slowly?
When adding sodium hydride in this process, it is necessary to control the dripping rate; otherwise, safety accidents may occur. The opacity is most likely due to an incomplete salt formation step earlier on.