Chemical Synthesis of the Dodeecanuceleotide. dCACAAGCTTGTG For studies of some sequence dependent structural factors the self‐complementary dodecanucleotide dCACAAGCTTGTG was required. Its chemical synthesis is reported according to the diester approach starting with the monomers dC, dpA, dpG, dpC and dpT.

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Chemical Synthesis of the Oligonucleotides dpG‐A‐T‐A‐T‐C, dpG‐A‐T‐C‐T‐T‐T‐T and dpT‐T‐T‐C‐A‐T‐C‐A‐T For studies of some sequence dependent structural factors the oligonucleotides dpG‐A‐T‐A‐T‐C, dpG‐A‐T‐C‐T‐T‐T‐T and dpT‐T‐T‐C‐A‐T‐C‐A‐T were required. Their chemical synthesis is reported according to the diester method.

The crystal structures of MoO(O2)zPO[N(CH3)213H20 (A) and MoO(O2)2PO[N(CH3)2]3CsHsN (B) have been determined. Three-dimensional X-ray data were collected on a linear diffractometer (Mo K~ radiation). The structures were solved by Patterson methods and refined by full-matrix least-squares analysis to a reliability index R= 0.032 for (A) and R= 0.048 for (B). In each compound the molybdenum atoms are surrounded by seven atoms forming a pentagonal bipyramid. The equatorial plane of the bipyramid contains the two peroxo groups and the oxygen atom of the phosphoramide. The apical positions are occupied by a double-bonded oxygen atom and a water molecule for (A) and a pyridine molecule for (B).

Chemical Synthesis of the Nonanucleosideoctaphosphate dA‐T‐G‐A‐T‐G‐A‐A‐A For studies on the specifity of enzymes, the nonanucleoside octaphosphate dATGATGAAA was required. Its chemical synthesis is reported starting with the monomers dA, dpT, dpG and dpA.