Thermal stability and fluxional behaviour of bicyclic sulphur–nitrogen structures of formula En5S3(E = CR, PR2, or SO2–)
Abstract
Two thermally induced N–S bond cleavage processes are available to EN5S3 heterocycles: (i) an irreversible loss of NSN to form EN3S2(for E = PR2 and SO2–) and (ii) a pseudo-degenerate 1,3-nitrogen shift which exchanges all nitrogen atoms (for E = CPh).