Vertex‐sharing BO4 and PO4 tetrahedra form the framework of the title compounds. Ca[BPO5] and Sr[BPO5] crystallize in the stillwellite structural type and contain tetrahedral chain anions [BPO], which can be described as loop‐branched “dreier” single chains. In Ba3[BP3O12] the tetrahedral anions form “zweifach” open “vierer” single chains. Given these results and the known linking modes of tetrahedral units, it is expected that borophosphates with layered and framework structures, as well as microporous structures, can be found.

ZUSCHRIFTEN sestrategie rnit der bereits beschriebenen fur die Endiin-Untereinheit von 1 konnte zu unmittelbaren Vorstufen von Dynemicin A 1 und zum Naturstoff selbst fuhren. Dariiber hinaus sind die neuen Verbindungen 3 und 4 als potentielle intercalierende Agentien gegenuber Doppelstrang-DNA von Tnteresse und vielleicht auch biologisch nutzlich[9-' ' I.

SrBPO5 was synthesized by a solid‐state reaction reported and by a new solid state reaction using BPO4 as a phosphating agent. It was also obtained by a hydrothermal method. The structure of the compound was solved by Rietveld analysis before. The examination of X‐ray powder diffraction data showed that, SrBPO5 is isostructural with CaBPO5 and BaBPO5. It crystallizes in the trigonal system in P3121 and the refined unit cell parameters are a = 6.8488(1), c = 6.8159(2) Å, Z=3 and Dm 3.77 g/cm3.

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