The synthesis of anhydro-2,3,5-triphenyl-4-hydroxyselenzolium hydroxide (4) is reported which is the first example of a mesoionic selenium hetercycle.
M. P. Cava and L. E. Saris, J. Chem. Soc., Chem. Commun., 1975, 617 DOI: 10.1039/C39750000617
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