Method for producing fluorene derivative
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United States of America Patent
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Issued Date -
May 3, 2007
app pub date -
Jan 29, 2002
filing date -
Jan 29, 2002
priority date (Note) -
Abandoned
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Abstract
Fluorenone and a phenolic compound (e.g., a 2-C.sub.1-4alkylphenol) is subjected to a condensation reaction in coexistence with a thiol compound and a hydrochloric acid aqueous solution to produce a fluorene derivative [e.g., 9,9-bis(C.sub.1-4alkylhydroxyphenyl)fluorene]. The proportion (weight ratio) of fluorenone relative to the thiol compound [fluorenone/the thiol compound] is about 1/0.01 to 1/0.5, and the proportion (weight ratio) of the thiol compound relative to hydrochloric acid (HCl) in the hydrochloric acid aqueous solution [the thiol compound/hydrochloric acid] is about 1/0.1 to 1/3. As the thiol compound, a mercaptocarboxylic acid (.beta.-mercaptopropionic acid) may be used. According to the method, a highly purified fluorene derivative excellent in transparency can be obtained inexpensively and simply without using a hydrogen chloride gas having handling difficulty.
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