Thermal reaction of a (hydrido)(selenolato)platinum(II) complex having a dibenzobarrelenyl group leading to three cyclometalations

The thermal reaction of a (dibenzobarreleneselenolato)(hydrido)platinum(II) complex gave two four-membered selenaplatinacycles, one of which is formed by hydroplatination of the Pt–H bond to the etheno bridge and the other is a vinylic C–H bond activation product, and a five-membered selenaplatinacycle formed by an aromatic C–H bond activation.