The structure of organophosphorus compounds. XXV. Crystal and molecular structure of fluorene-9-spiro-1-(3, 4-di-tert-butyl)-3,4-diphosphetane-2-spiro-9′-fluorne and 1,2-di-tert-butyl-1,2-diphosphorinane-(6,5,4-l,m)-fluorene-3-spiro-9′-fluorene

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