Absolute Konfiguration der (2-Amino-1-hydroxyethy1)phosphonsaure aus Key Words: (2-Amino-1 -hydroxyethyl)phosphonic acid (1-Amino-2-hydroxyethy1)phosphonic acid Die Zahl der bekannten, natiirlich vorkommenden Phosphonsauren nimmt standig zul -3). Ihre niitzlichen Eigenschaften und das Interesse an der Bildung dieser Verbindungen haben zu einer Reihe von Arbeiten zur Biosynthese dieser Naturstoffe angeregt 1,4,5). Es konnte gezeigt werden, da5 (2-Amino-1 -hydroxyethyl)phosphonsaure (1, OH-AEP) durch direkte Hydroxylierung von (2-Aminoethy1)phosphonsaure (2) entsteht ' ).
The crystal structures of the compounds Cr n Ge 19 (isotypic with Mn n Si le ), Mo I3 Ge 23 and V 17 Ge 31 have been determined by means of Fourier synthesis. The crystal structures are characterized by a tetragonal subcell forming a diamondlike arrangement similar to that of the titanium atoms in the TiSi 2 structure. The germanium deficiency according to the composition of a digermanide is correlated with the number of subcells along the c axis (11-, 13-and 17-fold subcell).
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