Taking the sting out of controlling rings: Highly regular, alternating cis-trans-polyenes solely containing five-membered rings have been prepared by living alkyne cyclopolymerization of 1,6-heptadiynes using fine-tuned Schrock initiators (see scheme). The resulting polyenes possess interesting physical properties that are different from those of existing poly(heptadiyne) systems.
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Anders et al. (2002) studied this question.