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The pentyl-substituted poly([1.1.1]propellane) 2 is a soluble polymer with a stiff main chain. It was obtained from the propellane 1, which is accessible on a 5-g scale in a three-step synthesis. Compound 2 is formed by anionically initiated, ring-opening polymerization of 1.
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Opitz et al. (1989) studied this question.
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