Organic compounds -- part of the class 532-570 series – Organic compounds – Oxygen containing
Reexamination Certificate
2005-12-20
2005-12-20
Richter, Johann (Department: 1621)
Organic compounds -- part of the class 532-570 series
Organic compounds
Oxygen containing
C568S330000
Reexamination Certificate
active
06977313
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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Hachiya Tetsuo
Kitamura Naoyuki
Mori Hiroaki
Sugio Youko
JFE Chemical Corporation
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Richter Johann
Witherspoon Sikarl A.
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