3,5-ジアセチル-1,4-ジヒドロ-2,6-ジメチルピリジンのポーラログラフィーとそのホルムアルデヒド定量への応用

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3,5-Diacetyl-1,4-dihydro-2,6-dimethylpyridine (DDL), prepared by the condensation of 1 mol of formaldehyde with 2 mol of acetylacetone in the presence of ammonia and applied to a colorimetric determination of formaldehyde, was studied by polarography. It was found that the direct current and square wave polarograms and the cyclic voltammograms of DDL at pH 2 and 10 showed irreversible reduction waves. DDL was easily oxidized to colorless 3,5-diacetyl-2,6-dimethylpyridine in acidic solutions by exposure to daylight and air, but stable in basic solutions. Thus, DDL solution should be made to be basic by adding tetraethylammonium hydroxide immediately after the reaction of formaldehyde with acetylacetone in the presence of ammonium acetate. Formaldehyde can be easily determined by the polarography of the alkaline DDL solution.
1989-08-25