Abstract
1. At temperatures above 350°, 1,2,3-trimethylcyclopentadiene isomerizes smoothly and reversibly to 1,2,4-trimethylcyclopentadiene. The equilibrium mixture contains these hydrocarbons in a 1.25∶1 ratio of the 1,2,3-isomer to the 1,2,4-isomer. 2. A new type of isomeric conversion of substituted cyclopentadienes has been found — the migration of a system of intracyclic double bonds as a consequence of an intramolecular 1,2-shift of the alkyl group. In combination with a 1,2-hydrogen shift, this process leads to the formation of an equilibrium mixture of structural isomers of substituted cyclopentadienes which differ in the positions of the substituents.
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