A 1H dynamic n.m.r. and ab initio SCF-MO study of thiophenium methylides (1) indicates that the compounds have lower inversion barriers at sulphur than the corresponding aliphatic ylides; the unusual stability of (1) may arise from conjugation of the sulphur lone pair with the ring.
T. Bowles, A. E. A. Porter, J. A. Rechka and H. S. Rzepa, J. Chem. Soc., Chem. Commun., 1984, 859 DOI: 10.1039/C39840000859
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