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Intramolecular Cycloaddition Reactions with Isobenzofurans, V 1) . ‐ Synthesis of rac ‐Thiamarmelerin, a Thiophene Analogue of a Naturally Occurring Furanosesquiterpene rac ‐Thiamarmelerin ( 7b ) is prepared by an intramolecular Diels‐Alder reaction of a thieno[2,3‐ c ]furan.
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Schöning et al. (1989) studied this question.
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