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  • Title: A stable bis(methylene)-λ4-selane with a >C[double bond, length as m-dash]Se[double bond, length as m-dash]C< bond containing Se(iv).
    Author: Sugamata K, Urao Y, Minoura M.
    Journal: Chem Commun (Camb); 2019 Jul 11; 55(57):8254-8257. PubMed ID: 31243414.
    Abstract:
    Bis(methylene)-λ4-selane 1, which represents a new class of heteroallenes, was synthesized and isolated as a stable purple crystalline solid. X-ray crystallographic analysis revealed a bent allene-type structure with pseudo C2v symmetry and a bent C[double bond, length as m-dash]Se[double bond, length as m-dash]C moiety that contains a 3-center-4-electron π-bond. The NMR spectrum of 1 shows compelling evidence for a slow rotation of the Se[double bond, length as m-dash]C moieties at room temperature. The 77Se NMR spectrum of 1 contains one signal in the region characteristic for Se(iv) compounds.
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