Medium-sized cyclophanes. Part 72. Synthesis and structures of 9-methoxy(1,4) naphthaleno[3.3]metacyclophane-2,11-diones

Syn- and anti-9-Methoxy(1,4) naphthaleno[3.3]MCP-2,11-diones (4) are obtained by the coupling reaction of 2,6bis[2-cyano-2-(toluenesulfony)ethyl]anisoles (2) and 1,4-bis(bromomethyl) naphthalene (3) in dimethylformamide (DMF) with an excess of sodium hydride.