Synthesis and thermolysis of novel spiroselenuranes bearing two oxaselenetane rings: double oxirane formation reactions from 1,5-dioxa-4λ4-selenaspiro[3.3]heptanesElectronic supplementary information (ESI) available: full experimental details and spectroscopic data. See http://www.rsc.org/suppdata/cc/b0/b009789f

Abstract

The first stable spiroselenuranes bearing two oxaselenetane rings have been synthesized, chracterized by X-ray crystallographic analysis, and shown to be thermally reactive giving two molar equivalents of the corresponding oxirane with elimination of elemental selenium, in sharp contrast to the behavior of the phosphorus and silicon analogues.