The novel sulphide (1a) is much less stable than its isomer (2a), and the stable sulphone (1b) could be resolved into the helical enantiomers (t½ 92.5 min at 100 °C; free enthalpy of racemisation 127 kJ/mol; n.m.r. and c.d. data and results of molecular mechanics calculations are compared to those of isomeric helical molecules.
F. Vögtle, K. Mittelbach, J. Struck and M. Nieger, J. Chem. Soc., Chem. Commun., 1989, 65 DOI: 10.1039/C39890000065
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