Circular dichroism and anomeric configuration assignment of benzimidazole C-nucleoside analogs.

The circular dichroism of a series of acyclic polyhydroxyalkyl benzimidazole C-nucleoside analogs was correlated with the stereochemistry of the chiral carbon atom α to the benzimidazole base moiety. This correlation was used for the assignment of the anomeric configuration of 2-(β-L-erythrofuranosyl) benzimidazole C-nucleoside analogs without a need to have the other anomer on hand, in a similar manner to the correlation obtained for assignment of the anomeric configuration of triazole C-nucleoside analogs.

Cooperativity of H-bonding and anion-π interaction in the binding of anions with neutral π-acceptors.

A rare anion-π complex between bromide and a neutral receptor is reported and related receptor systems are studied with a series of anions. The interaction is observed in the solid state and in solution, and further evidence for it is obtained by a computational study.

Tuning the size of supramolecular M4L4 tetrahedra by ligand connectivity.

Triangular triscatechol ligands are prepared in facile reaction sequences. The catechol units are either bound to the triangular backbone through their 3- or 4-position. With titanium(IV) ions, the ligands form metallosupramolecular M(4)L(4) tetrahedra which are characterized by ESI MS and proton NMR.

Anion-π interactions in salts with polyhalide anions: trapping of I4(2-).

The directionality of interaction of electron-deficient π systems with spherical anions (e.g,. halides) can be controlled by secondary effects like NH or CH hydrogen bonding.