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The preparation of 3,9-Dibromo-2,4,8,10,3,9-tetraoxodiphosphospiro- (5,5) -3,9-dithio undecan is described. From this compound or from the analogous dichloro compound the bifunctional dithio acid 3,9-Dithiol-2,4,8,10,3,9-tetraoxodiphosphospiro- (5,5) -dithio undecan, its Na- and K-salt as well as the methylester are obtained. The acid and the alkali salts give coordination polymers with many metal salts.

zeitschrift für naturforschung b

Einige neue Phosphor-Derivate des 2.2-Bis-(hydroxymethyl)-1.3-propandiols (Pentaerythrit) / On the Knowledge of Organophosphorus Compounds, XIII Some New Derivatives of 2.2-Bis- (hydroxymethyl) -1.3-propandiol (Pentaerythrit)