Tc. Chou et al., SYNTHESIS AND DIELS-ALDER REACTIONS OF A FACIALLY DISSYMMETRIC TETRACYCLO-FUSED MALEIC-ANHYDRIDE WITH CYCLIC DIENES, Tetrahedron letters, 35(24), 1994, pp. 4165-4168
Facially dissymmetric maleic anhydride 1 is synthesized and undergoes
Diels-Alder cycloadditions with cyclic dienes exclusively on the face
syn to its etheno-bridges.