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Fremgangsmåde til fremstilling af 5-sulfonylpropyl- eller 5-sulfonylpropyliden-5H-dibenzo-[a,d]-cycloheptener eller -5H-dibenzo-[a,d]-10,11-dihydrocycloheptener.
Fremgangsmåde til fremstilling af en gummiagtig elastomer bestående af en eventuelt vulkaniseret, lineær copolymer af en umættet endomethylenforbindelse og ethylen eller en aliphatisk α-alken eller begge dele.