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Simple heating of a dime/dienophile precursor can provide either gram-quantities of the [6] beltene derivative 1 or a ribbon-like polymer. Compound 1 is stereochemically uniform, and in the crystalline state it takes the form of flattened, double-stranded rings. The morphology of the ribbon polymer (with a polymerization degree of 24–330!) resembles a “two-dimensional coil.” R (CH2)6.
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Godt et al. (1989) studied this question.
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