The β-hydrogen hyperfine coupling constant for the thietane cation is 31.1 G (1 G = 10–4 T) whereas the corresponding value for teh thiirane cation is only 16.1 G, demonstrating that CH2 hyperconjugation in sulphur heterocycles is much diminished in going to a three-membered ring.
X. Qin and F. Williams, J. Chem. Soc., Chem. Commun., 1987, 257 DOI: 10.1039/C39870000257
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