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A thermal intramolecular endo-selective Diels-Alder reaction with a substituted Feringa-butenolide is described. The structure of the main product is determined by single crystal X-ray analysis. By double activation of the dienophile substructure a dramatic increase in reactivity is reported, which leads to a decrease in reaction temperature by more than 100 o C.
The first epc-synthesis of a chiral calix[8]arene starting from (-)-menthone is described. In a three step sequence a new enantiomerically pure calix[8]arene derivative is obtained in good yield.
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