No abstract

Pyrolysis of the photodimer of VUIb. The dimer of VIIIb (0.3g.) was heated at 180-185°( metal bath) in a Pyrex test tube for 10 min. The colorless dimer melted with yellow' color, and upon cooling the reaction mixture, followed by crystallization, VUIb was obtained in almost quantitative yield.

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The solution formed from the reaction of lithium with ethylenediamine, which probably contains H,NCHtCHZNHLi, is capable of rapidly and quantitatively isomerizing a terminal olefin to an internal olefin. A cyclic diene (such as 4vinyl-cyclohexene) is converted to the corresponding aromatic hydrocarbon, with evolution of hydrogen gas; this reaction takea place slowly even at room temperature. The correaponding sodium compound, HsNCH2CH2NHNa, isomerizes olefinic double bonds a t a very slow rate; however it will rapidly aromatize a cyclic diene in which the double bonds are already conjugated and in the ring.

No abstract