Fig. 52. (a) Flood's cyanostar macrocycle 103 and its enantiomeric P and M bowl conformations. (b) Schematic representation of the possible stereoisomers of [3]rotaxane 105 formed when 103 encircles phosphate axle 104.121 The observed (P,P,S,S), (M,M,R,R) and (P,M,S,R) stereoisomers are highlighted in red. Counter ions omitted for clarity.
