Abstract
1. Biisocrotyl, which, according to Lebedev, should be ??? to type ??? in his proposed scheme for the classification of dienes, is hydrogenized in presence of ???, palladium, and nickel in all possible ways, and must ascribed therefore to type ???. 2. In presence of each of these ???, 1,2-addition predominates. 3. The lowest selectivity in the addition of hydrogen is observed in presence of platinum, and the greatest in presence of nickel, when 90% of the hydrogenation product consists of 2,5-dimethyl-2-hexene (1,2-addition of hydrogen) and there is ??? no formation of ???. 4. In no case does the form of the curve in the rate of hydrogen addition indicate the characteristics of the actual course of action. 5. When 2,5-dimethyl-???-hexane is hydrogenated in presence of platinum of nickel, transposition of the double bond to the center of the molecule is not observed. 6. Variation in the amount of catalysts has no effect on the character of the hydrogenation curve.
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