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2-Carboxybenzaldehyde

2022-06-22
Carboxybenzaldehyde has the properties of aldehyde and acid. It can be formed into ester with alcohol, reduced to Ag(NH3)2NO3, and formed into oxime with H2NOH. Heated to the melting point, it can be formed into anhydride (diphenylphthalide ether).


It is an important intermediate in the synthesis of antipyretic and analgesic drugs. It is a white to quasi-white crystalline powder with melting point of 96 ~ 100℃.


carboxyl benzaldehyde is usually obtained from the bromination and hydrolysis of phenol. Heat phenol, pass through bromine reaction, control pass through speed, make reaction tail gas basically no bromine vapor discharge, pass through bromine, reactant add water, hydrolysis. O-carboxyl benzaldehyde was precipitated after cooling.


Obtained by bromination and hydrolysis of phenol. Heat phthalein to 140-145℃, bromine reaction, control the inlet speed, so that the reaction tail gas basically no bromine vapor discharge. After bromine removal, the residual hydrogen bromide was removed by carbon dioxide and decompression at 120℃ chemical book. The reactants were hydrolyzed with water for 0.5h in boiling water bath. O-carboxyl benzaldehyde was precipitated after cooling. Yield of 60%.



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