Fig. 71. Stoddart's pretzelane 143 that displays bias between enantiomeric (co)conformations due to a single fixed covalent stereocentre and its modelled structure, showing the predicted preferred (co)conformation.155 The assigned stereochemistry is listed in the order covalent point, conformational planar, co-conformational covalent planar, co-conformational mechanical helical. R = (CH2OCH2)3. Reproduced from ref. 154 from The Royal Society of Chemistry.
