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The cyclic [5]meta-phenyleneacetylene (3) ([5]CMPA) and its corresponding cyclophane polyones 4 and 5 are synthesized. 3, a “missing link” between [4]CMPA and [6]CMPA, shows a fairly pronounced emission, indicating a rigid structure, whereas 5 is colorless in contrast to conventional diarylethane-1,2-diones owing to its conformational mobility and all-s-cis and twisted dione structure.

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Cyclophanes O 0450 Synthesis and Properties of Cyclic [5]meta-Phenyleneacetylene and ItsCorresponding Cyclophane Polyone, [2 5 ](1,3)Cyclophanedecaone. -Title compound (I) and the corresponding polyone (III) as well as dione (II) are synthesized and their properties are examined. (I) shows a fairly pronounced emission indicating a rigid structure. In contrast, (III) is colorless owing to its conformational mobility. -(YAMAKAWA, J.; OHKOSHI, M.; TAKAHASHI, F.; NISHIUCHI, T.; KUWATANI, Y.; NISHINAGA, T.; YOSHIDA, M.; IYODA*, M.; Chem. Lett. 37 (2008) 7, 784-785; Dep. Chem., Grad. Sch. Sci. Eng., Tokyo Metrop. Univ., Hachioji, Tokyo 192-03, Japan; Eng.) -M. Paetzel 47-062

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