2-cyanophenylboronic acid or ester thereof in which impurities are decreased, and production method thereof
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United States of America Patent
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Oct 21, 2014
Grant Date -
Jul 23, 2009
app pub date -
Apr 11, 2007
filing date -
Apr 28, 2006
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Abstract
A method for producing high-purity 2-cyanophenylboronic acid, characterized by reacting benzonitrile, lithium 2,2,6,6-tetramethylpiperidide, and trialkoxyborane, adding an aqueous acidic solution to a reaction solution containing the obtained 2-cyanophenylboronic acid, carrying out a contact treatment at a pH of below 7 in the presence of a water-immiscible organic solvent, and then obtaining the 2-cyanophenylboronic acid from the organic layer.
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