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Cobalt studs the beltenes shown (R=H, CO2Me, SiMe3, 5 Me), which consist of annelated, conjugated four- and eight-membered rings. These strained molecules were synthesized in a one-pot reaction by a template supported trimerization of 5,6,11,12-tetradehydrodibenzo[a,e]cyclooctene.
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Hellbach et al. (2004) studied this question.
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