REDUCTION OF BENZALDEHYDE 201of aluminum and 500 cc. of isopropyl alcohol, are added 210 g. (3 moles)of crotonaldehyde and 1 1. of dry isopropyl alcohol. A 2-1. round-bot-tomed flask is used, equipped with an 80-cm. Vigreux column, the upperend of which is connected to a water condenser set for downward dis-tillation. The~mixture is heated with an oil bath, and the acetone slowlydistils as it is formed. The temperature of the distillate is maintainedat 60 to 70° (bath 110°), and when the distillate no longer gives a testfor acetone (eight to nine hours) most of the remaining isopropyl alcoholis distilled under reduced pressure.*The residue is cooled to 40° and slowly hydrolyzed (cooling as neces-sary) with 900 cc. of cold 6 JV sulfuric acid, prepared from 145 cc. ofconcentrated sulfuric acid and 790 cc. of water. The oily layer is sep-arated, washed once with water, and distilled at 60-70° while the pres-Bure is lowered slowly from about 275 mm. to 65 mm. Finally the dis-tillation is continued to 100° and 20 mm.
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