Crystal and molecular structure and spectra of 2′,2′,5,5,5′,5′,7,7-octamethyl-2′,5,5′,7-tetrahydrofuro[3,4-d]-1-oxa-3,4-disele-nin-2-spiro-3′-furan-4′(3′H)-one from selenium dioxide oxidation of 2,2,5,5-tetramethyltetrahydrofuran-3-one. A novel six-membered heterocyclic ring system in the chalcogen series

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