Abstract
The previously undescribed hydrocarbons, bicyclo[6,1,0]nona-2,6-diene (5) and tricyclo[6,1,0,04,9]nona-2,6-diene (11) have been prepared; the former compound (5) slowly isomerizes at room temperature to give bicyclo[5,2,0]nona-2,5-diene (7).

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