Abstract
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.
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