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Two new shape-persistent macrocycles with intraannular pyridine groups are described. The cyclization is performed by an intermolecular oxidative acetylene dimerization of two “half-rings” which is prepared by Pd-catalyzed aryl acetylene coupling reactions. In both cases the ring building blocks are synthesized from pyrylium salts, either by treating with sodium pyridyl acetate or with ammonia. One...
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