L. Meerpoel et al., HOMOCHIRAL MATCHING IN THE DIELS-ALDER CLYCLODIMERIZATION 2-VINYL-7-OXABICYCLO[2.2.1]HEPT-2-ENE DERIVATIVES, Tetrahedron letters, 35(1), 1994, pp. 111-114
Racemic 6-vinyl-7-oxabicyclo[2.2.1]hept-5-en-2-one, 5-vinyl-7-oxabicyc
lo[2.2.1]hept-5-en-2-one and their ethylene acetals undergo highly ste
reoselective Diels-Alder cyclodimerizations. The optically pure semicy
clic dienes give the corresponding optically pure dimers with the same
ease.