The 2-selenoimidazolines 5 are obtained from the reaction of the imidazol-2-ylidenes 4 with selenium in very good yields. The ylidic nature of the carbon selenium bond (2) is revealed both by NMR and by X-ray analysis. On comparison with the corresponding tellurium compounds 3, reduction of the carbon chalcogen bond order in 5 is suggested.
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Kühn et al. (1993) studied this question.