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Abstract
Acecyclone and related cyclopentadienones 11 react with dimethyl tricyclo[4.2.0.0 2,5]deca-3,7,9-triene-7, 8-dicarboxylate 1 in refluxing xylene to afford the cyclo-octatetraenes 12, via a sequence involving [4+2]π-cycloaddition, cheletropic loss of carbon monoxide, extrusion of dimethyl phthalate by [4+2]π-cycloreversion, and finally valence isomerisation by retro-6π electrocyclisation. NMR evidence indicates that the products 12 contain rigid, bond-fixed, non-planar cyclo-octatetraene rings.
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