Abstract: The fmt synthesis of cyclophanes containing aromatic nuclei with two heteroatoms is described. A Hoffman pyrolytic route was used. Two isomeric [2.2](2, 5) oxazolophanes (6a and 6b) and two isomeric [2, 2](2, 5) thiazolophanes (13a and 13b) were isolated. In both cases the isomers were found to have the anti-anti and the anti-syn structure. The assignments were made by spectral analysis and variable-temperature nuclear magnetic ...
