Process for preparing aromatic fluorides
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United States of America Patent
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Apr 21, 1992
Grant Date -
N/A
app pub date -
May 23, 1990
filing date -
May 23, 1990
priority date (Note) -
Expired
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Abstract
An improved process is disclosed for preparing aromatic fluorides by diazotization-fluorination in hydrogen fluoride. The improvement includes, prior to the decomposition of the diazonium fluoride, adding to the diazotizing reaction mixture, urea or a salt thereof in an amount sufficient to reduce the vapor pressure of hydrogen fluoride over the diazonium solution. Also disclosed is a process for reducing the vapor pressure over diazonium fluoride solutions.
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