466 Chemistry Letters, 1 9 9 4 conformational orientation,6) which is indispensable as the ”hinge” spacer of macrocyclic and open-chain type host molecules.” Based on these findings, the corresponding counterparts, 2,3-diarylbenzene-1,4-diones (4), attract our attention as the candidate of the ”hinge” spacer. In general, synthetic strategies of aryl-substituted benzene-1,4-diones (3-8) in the past can be classified into the following three categories: ...
