Organic Lab Reactions 205

Organic Lab Reactions 205 - 200 REDUCTION WITH ALUMINUM...

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200 REDUCTION WITH ALUMINUM ALKOXIDES may be used. An equal volume of isopropyl alcohol is added with the ketone to the aluminum isopropoxide solution when the reduction is car- ried out. Acetone Test Reagent (2,4-Dimtrophenylhydrazine) 6 A 0.1% solution of the reagent is prepared by dissolving 0.12 g. of 2,4-dinitrophenylhydrazine in 25 cc. of distilled water and 21 cc. of con- centrated hydrochloric acid by warming on the steam bath. The clear yellow solution is then cooled and diluted to 125 cc. with distilled water. For use, several drops of the reagent and a few drops of the acetone- isopropyl alcohol distillate are mixed in a small test tube. The presence of acetone is shown by the formation of a yellow cloudy suspension or pre- cipitate of acetone 2,4-dinitrophenylhydrazone. The test is considered negative if no cloudiness forms within one-half minute when 3 cc. of the reagent is added to 5 drops of distillate. After a negative test is obtained, it is advisable to reflux the mixture for five to fifteen minutes with com-
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This note was uploaded on 11/20/2011 for the course CHM 2210 taught by Professor Reynolds during the Fall '01 term at University of Florida.

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