Abstract
The possible use of the SO stretching vibration as a conformational probe for the conformational analysis of six-membered cyclic sulphites has been shown on nine 5-chloro sulphites. Ananchomeric 2,5-axis twist forms have been demonstrated for five tert-butylated 5-chloro sulphites and conformational equilibria with 2,5- (and 1,4-) axis twist form participation for three dimethylated and one tert-butylated derivatives. Conformational A Cl and A SO energies were deduced from chair forms and the weak free energy difference between chair and twist forms was confirmed.
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