Synthesis of Large Macrocyclic Azacalix[<i>n</i>]pyridines (<i>n</i> = 6 − 9) and Their Complexation with Fullerenes C₆₀ and C₇₀

Large methylazacalix[n]pyridines (n = 6−9) were synthesized effectively from the Pd-catalyzed macrocyclic fragment coupling reactions between α,ω-dibrominated and α,ω-diaminated linear oligomers. As macrocyclic host molecules, they formed a 1:1 complex with fullerenes C60 and C70 with association constants ranging from 3 × 104 to 1 × 105 M−1.