A commercial mixture of methylcyclopentadiene dimers mainly consisting of four dimeric compounds with partial structures of I-methyl-and 2-methylnorbornene, undergoes slow oxidation and isomerization when it is dissolved in CH,Cl,, CHCl, or CCI,. Both reactions are simultaneous but independent of each other. Isomerization only concerns those isomers that contain in their structure a 2-methylnorbornene ring.The nature of the isomerization and the influence of different acid media is studied.
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