Supramolecular Species Bearing Quaternary Azaaromatic Moieties

Threading Cyclodextrins in Chloroform: A [2]Pseudorotaxane

“…In this respect, taking advantage of the development of efficient methods for exhaustive and selective functionalization [27–29], a number of papers have appeared in recent years on the construction of supramolecular structures composed of chemically-modified CDs and viologen derivatives [9,30–33]. In particular, cyclodextrins bearing acyl groups on the secondary face can efficiently yield inclusion complexes in polar organic media (acetonitrile, acetone) where a dicationic bipyridinium moiety is tightly bound owing to carbonyl oxygen-cation interactions.…”

Inclusion Complexes Containing Quaternary Azaaromatic Moieties

“…The addition of 10 leading to inclusion complex (12) Four bispyridinio-appended γ-CD isomers (13)(14)(15)(16) were synthesized to create a molecular receptor for controlling the stereoselectivity of photocyclodimerization of 2-anthracenecarboxylate (17) Photocyclodimerization of 17 affords four kinds of configurational isomers (18)(19)(20)(21). In the molecular microreactor the interaction between two guest molecules is facilitated.…”

“…The major product of the photocyclodimerization of 17 in the presence of cation-charged γ-CD are headto-head isomers (18) and (19), while in the presence of native γ-CD the main product are head-to-tail isomers (20) and (21).…”