P. Schuchmann et K. Hafner, SYNTHESIS AND REACTIONS OF [N](1,6)AZULENOPHANES AND [N](2,6)AZULENOPHANES, Tetrahedron letters, 36(15), 1995, pp. 2603-2606
A synthesis of [n](1,6)- and [n](2,6)azulenophanes 4 and 5 (n = 11,12,
13) by intramolecular condensation of 4-(omega-cyclopentadienylalkyl)-
1-methylpyridinium salts 3 and some reactions of 4 and 5 are described
.