The Zincke form of this class of compounds results from the reaction of a pyridinium salt with 2,4-DNP and a primary amine. The presence of this functional group can be distinguished by an absorption band around 2720 to 2820 inverse centimeters in IR spectroscopy, or by a chemical shift of around 9-10 delta in proton NMR spectroscopy.  They undergo disproportionation in the Cannizzaro Reaction to yield acids and alcohols, and they can be detected
The Zincke form of this class of compounds results from the reaction of a pyridinium salt with 2,4-DNP and a primary amine. The presence of this functional group can be distinguished by an absorption band around 2720 to 2820 inverse centimeters in IR spectroscopy, or by a chemical shift of around 9-10 delta in proton NMR spectroscopy.  They undergo disproportionation in the Cannizzaro Reaction to yield acids and alcohols, and they can be detected by a brick red precipitate in Fehling's Test or by the formation of a silver mirror on the wall of a test tube in the Tollens test. FTP, name this class of organic compounds defined by a terminal carbonyl group.
The Zincke form of this class of compounds results from the reaction of a pyridinium salt with 2,4-DNP and a primary amine.
aldehydes