Dichalcogenolanes by ring-expansion of transition metal-coordinated thietanes and selenetanes

Abstract

Pentacarbonyltungsten-coordinated selenetanes react with seleno- and telluro-cyanate by insertion of the chalcogen atom into the Se–C bond of the selenetanes to give 1,2-diselenolanes and -selenatellurolane, respectively; the analogous reaction of (CO)₅W[[graphic omitted](OEt)H] with tellurocyanate affords a 1,2-thiatellurolane complex.