New hexameric cyclophenyleneethynylenes (CPEs, 1) were synthesized by alkyne metathesis of meta-dipropynylated benzenes. Treatment of one of these CPE derivatives (R1=tert-butyl, hexyl, dodecyl; R2=H, methyl) with [Os3(CO)10(MeCN)2] led to a decacarbonyltriosmium–CPE complex in which the planarity of the ring was significantly disrupted, as evidenced by the results of the single-crystal X-ray diffraction analysis.
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Ge et al. (2000) studied this question.
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