摘要:
The observed geometries of the cyclophane groups of 4-(2'-furyl) [2.2]paracyclophane [systematic name: 5-(2-furyl)tricyclo[8.2.2.2(4,7)]hexadeca-4,6,10,12,13,15-hexaene], C20H18O, and 5-(2'-thienyl) [2.2]paracyclophane [systematic name: 5-(2-thienyl)tricyclo[8.2.2.2(4,7)]hexadeca-4,6,10,12, 13,15-hexaene], C20H18S, are very similar both to the skeleton of the parent compound and to [2.2]paracyclophane fragments in other structures; the bridgehead C atoms are characteristically bent out of the plane of the other four coplanar atoms building the typical boat conformation of the aromatic rings in [2.2]paracyclophanes. These rings are twisted with respect to each other. The thiophene ring of (2) is disordered over two positions, which could however be well resolved. The heterocyclic substituents are rotated out of the plane of the four coplanar C atoms C4, C5, C7 and C8 by 25.1(1)degrees in (1), and 34.7(6) and 32.9(6)degrees in (2) for both positions of disorder.