Abstract
The dienic condensation of 1,2,3,4,5-pentamethylcyclopentadiene with maleic anhydride proceeds stereospecifically in relation to the configuration of the substituent in position 7 (the bridge) forming bicyclo[2.2.1] heptene derivatives: the ratio of the 7-syn-methyl- and 7-anti-methyl isomers (in relation to the double bond) corresponds to 3.5:1, respectively.
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