Superphanes. formation

Seventeen years after Boekelheide s landmark synthesis of [2f,](l, 2, 3, 4, 5, 6)cyclophane (also known as superphane) [36], Shinmyozu very recently described the synthesis of the homologous superphane [3 ](l, 2, 3, 4, 5, 6)cyclophane (53, Scheme 12) [37], Formation of the I inal bridge of this molecular pinwheel was accomplished with an intramolecular aldol condensation. While the double bond of enone 50 could be... 

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