BS8 ITSThe reactions of cyclopentadiene with cyclohexa-2.4-dienones of general structure (VII) have been shown to proceed by initial diene addition of the hydrocarbon to the 4,5-double bond of the cyclohexadienone. The resulting adducts, which are derivatives of tricyclo[6,2,1 ,O 2, ' 1 undeca-5,9-dien-4-one (111), rearrange even at room temperature to give products having the tricyclo[5,2,2,02~6]undeca-4,1 O-dien-8-one skeleton (I), but their intermediacy has been demonstrated by trapping experiments with phenyl azide.CYCLOHEXA-~,~-DIENONES act as dienes towards dienophiles such as maleic anhydride and acetylenedicarboxy-
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