Synthesis and Studies of Symmetrical DitelluraCalix[6]phyrin(1.1.1.1.1.1)s.

Rare examples of ditellura calix[6]phyrin(1.1.1.1.1.1)s containing two telluratripyrrin units connected via two sp 3 carbons were synthesized by condensing 16-telluratripyrrane with a cyclic ketone in CH 2 Cl 2 under acid-catalyzed conditions. The X-ray structure obtained for meso -cyclohexyl-substituted calix[6]phyrin revealed that the macrocycle resembles a roof-like shape with two telluratripyrrin units that are perpendicular to each other, whereas the DFT-optimized structure of meso -cyclopentyl-substituted calix[6]phyrin showed a bird-like structure with two telluratripyrrin units that are almost in the same plane.