T. Seppala et al., [2.2.2]M,P,P-CYCLOPHANE-AG-TRIFLATE AND [2.2.2]M,M,P-CYCLOPHANE-AG-TRIFLATE - NEW PI-PRISMAND COMPLEXES, New journal of chemistry, 22(8), 1998, pp. 789-791
The 17- and 16-membered [2.2.2]m,p,p- and [2.2.2]m,m,p-cyclophane form
crystalline 1:1 Ag-triflate pi-prismand complexes surprisingly simila
r to the well-known 18-membered p,p,p-isomer.