| Abstract
| - Series of cyclic amides containing optically active helicene, (P)-1,12-dimethylbenzo[c]phenanthrene,are synthesized using a building block method. The building block consists of one (P)-helicene unitand one dianiline unit with its amino-terminal-protected with benzyloxycarbonyl and its acidterminal activated as acid chloride. The coupling with (P,P....)-[(n − 3) + (n − 2)]diamine followedby deprotection gives (P,P....)-[(n − 1) + n]diamine, which possesses n − 1 parts of (P)-heliceneand n parts of dianiline. Cyclization of the (P,P....)-[(n − 1) + n]diamine with helicenediaciddichloride gives (P,P....)-[n + n]cycloamide. All the members of (P,P)-[2 + 2]cycloamide to(P,P,P,P,P,P,P,P,P,P)-[10 + 10]cycloamide are synthesized using this method, and are comparedspectroscopically.
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