Abstract
Pyrolysis of anti-8,16-dimethoxy[2.2]metacyclophane at 500°C gave 17-oxa[2.2.1](1,3,2)cyclophane in 35% yield arising from intramolecular condensation reaction of syn-8,16-dimethoxy[2.2]metacyclophane; similar results were also obtained in the pyrolysis of the higher anti- and syn-dimethoxy[3.2] metacyclophane to afford the corresponding 18-oxa[3.2.1](1,3,2)cyclophane. The mechanism of this novel intramolecular condensation reaction is discussed.
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