Highly stereoselective preparation of the oligomer 1 is possible “simply” by means of a structure-directed synthesis, that is, without any use of controlling reagents or catalysts. The 3 :2 Diets–Alder adduct of diene and dienophile has an all-syn configuration and is coiled in such a way that the two ends approach each other.
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Ashton et al. (1989) studied this question.
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