THE DESIGN OF INNER-FUNCTIONALIZED U-SHAPED CAVITY MOLECULES - ROLE OF PHENYL SUBSTITUENTS AT THE 1,3-POSITION OF ISOBENZOFURANS AND OXA-BRIDGES IN THE DIENOPHILE AS STEREOCHEMICAL CONTROLLING ELEMENTS

1,3-Diphenylisobenzofuran reacts with fused mono- and bis-norbornenes, 7-oxanorbornenes and cyclobutene-1,2-diesters with high stereospecifi city whereas the corresponding isobenzofuran cycloadditions produce mi xtures; this provides a basis for regulating geometry in the construct ion of polyalicyclic nanostructures.