Production process of 2,7-dibromofluorenone
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United States of America Patent
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Dec 20, 2005
Grant Date -
Mar 25, 2004
app pub date -
Sep 23, 2003
filing date -
Sep 24, 2002
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Abstract
A process is provided for the production of 2,7-dibromofluorenone. According to the process, a 2,7-dibromofluorene-contianing raw material is oxidized with molecular oxygen in the presence of a phase transfer catalyst such as a quaternary ammonium salt in a heterogeneous, mixed solvent of an aqueous solution of a caustic alkali and a water-insoluble organic solvent. Crude crystals of 2,7-dibromofluorenone, which have been obtained by the oxidization, can be purified by recrystallization to recover 2,7-dibromofluorenone as crystals having a purity of at least 99 wt. %.
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