Abstract

Racemic 6-vinyl-7-oxabicyclo[2.2.1]hept-5-en-2-one, 5-vinyl-7-oxabicyclo[2.2.1]hept-5-en-2-one and their ethylene acetals undergo highly stereoselective Diels-Alder cyclodimerizations. The optically pure semicyclic dienes give the corresponding optically pure dimers with the same ease.

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