The 3,4-dicyano derivative of hitherto unknown tricyclo[4.2.2.22,5]dodeca-1,3,5,7,9,11-hexaene, in which six double bonds are uniquely arranged, is generated and chemically trapped with 1,2-dimethylenecyclopentane and tert-butyllithium.
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Tsuji et al. (1997) studied this question.
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