Synthesis of Enantiopure T-Symmetrical [6:0]-Hexakis Adducts of C60 Equipped with 1,2-Glycol Substituted cyclo-Monomalonate Addends

A covalent organic cage compound acting as a supramolecular shadow mask for the regioselective functionalization of C60

A trigonal-bipyramidal covalent organic cage compound serves as an efficient host to form stable 1 : 1-complexes with C₆₀ and C₇₀. Fullerene encapsulation has been comprehensively studied by NMR and UV/Vis spectroscopy, mass spectrometry as well as single-crystal X-ray diffraction. Exohedral functionalization of encapsulated C₆₀via threefold Prato reaction revealed high selectivity for the symmetry-matched all-trans-3 addition pattern.

The taming of the Prato reaction: a covalent organic cage compound serves as a supramolecular template for the regioselective functionalization of C₆₀.

Cycloaddition Reactions of Azomethine Ylides and 1,3-Dienes on the C2v-Symmetrical Pentakisadduct of C60

The reactivity of the C_2v-symmetric pentakisadduct of C₆₀ with azomethine ylides and conjugated dienes was studied experimentally and computationally. This derivative possesses four [6,6] double bonds, each with unique electrophilicity. The Diels-Alder reaction studied is a regiospecific, kinetically and thermodynamically guided [4 + 2] process producing [5:1]-hexaadducts with an octahedral addition pattern. The kinetically controlled Prato reaction gives a mixture of regioisomeric [5:1]-hexaadducts. The synthesis of geometrically well-defined supramolecular architectures may benefit from these new types of highly functionalized [5:1]-hexaadducts.

Metal-Based Diversity for Crystalline Metal-Fullerene Frameworks

Four different three-dimensional metal-fullerene frameworks were synthesized through polymerization of two C₆₀ -derived dodecaacids with varying alkyl spacers in the presence of Ca²⁺ , Cu²⁺ or Cd²⁺ ions. Structural analysis of the frameworks was performed by single-crystal X-ray diffraction and porosity of the materials was investigated by sorption measurements.