Intermolecular cycloaddition of the bifunctional tetrachlorotribenzene 1 results in higher Diels-Alder oligomers of benzene (2), of which the linear and an angular hexamer (n=1) were characterized. The oligomers decompose above 110°C through stepwise extrusion of benzene and tetrachlorobenzene.
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Grimme et al. (1998) studied this question.