series of helical-chiral 1-thia-10-aza[2.2]metacyclophanes 2–11 with different substituents at the nitrogen atom and at the aromatic ring have been synthesised and their chiroptical properties examined. These new N-substituted phanes are more suitable for the investigation of structure-chiroptics relationships than the already characterised N-tosylated aza[2.2]phanes. Their absolute configuration can be
Two series of [8]metacyclophanes with cis or trans configurated double bonds or triple bonds in the bridges were prepared; the first series 6, 8, and 10 contains phenylethynyl, the second series 13, 14, and 15 phenylethenyl substituents so that ππ interactions between the π centres in the bridge and the π centres of the basic chromophores tolan and trans-stilbene, respectively, can be studied.