Treatment of 1,2,3-thiadiazoles and selenadiazoles (1) with di-iron nonacarbonyl gives thioxo- and selenoxo-carbene complexes [e.g.(4)]; formation of cross-over products, (6) and (7), from 4,5-disubstituted diazoles implicates thiiren and seleniren derivatives as symmetrical intermediates.
P. G. Mente and C. W. Rees, J. Chem. Soc., Chem. Commun., 1972, 418b DOI: 10.1039/C3972000418B
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