Helical chirality in donor-acceptor catenanes.
A [2]catenane in which the macrocyclic polyether, bisparaphenylene[34]crown-10, is interlocked with the tetracationic cyclophane, cyclobis(paraquat-p-phenylene), is shown by dynamic (1)H NMR spectroscopy, using (i). neutral and (ii). anionic chiral shift reagents (CSRs), to exist at low temperatures (197 K) in acetone-d(6) solutions as 1:1 and 2:1 mixtures of diastereoisomeric complexes and salts, respectively, as a consequence of the helical chirality associated with the [2]catenane interacting with the CSRs.
Vignon
Scott A
SA
Department of Chemistry and Biochemistry, University of California, Los Angeles, 405 Hilgard Avenue, Los Angeles, California 90095-1569, USA.
Wong
Jason
J
Tseng
Hsian-Rong
HR
Stoddart
J Fraser
JF