Trimethylene sulfite

57) indicated that the conformational preference for the equatorial orientation amounts to about 2kcalmol in CCI4 [98]. Interestingly, the differences in free energies (AG° values,) decrease with increasing solvent polarity (Table 3.4) suggesting that the more polar diastereoisomer (46-eq) is stabilized in more polar media. 

In addition to dipole-dipole interactions, a stereoelectronic effect is likely to stabilize the axial orientation of the S=0 bond in trimethylene sulfite. In 

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Buchanan, G.W., Cousineau, C.M.E., and Mundell, T.C., Trimethylene sulfite conformations effects of sterically demanding substituents at C-4,6 on ring geometry as assessed by I I and 13C nuclear magnetic resonance, Can. J. Chem., 56, 2019, 1978. 

C2Hi,03Se2, trans-Ethanediseleninic anhydride, 20, 524 C3H4CI2O3S, 2,2 -Dichlorotrimethylene sulfite, 33B, 147 C3HeOSe2f 1-Oxa-3,5-diselenane, 41B, 445 C3H6O3S, Trimethylene sulfite (gas-ed), 35B, 893 C3H6O3S, Trimethylene sulfite, 31B, 159... 

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