Dihydroxyoligosilanes as novel ligands in coordination chemistry - First synthesis of 2,5-dioxa-3,4-disilatitanacyclopentanes

Douglas Hoffmann, Helmut Reinke, Clemens Krempner

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21 Scopus citations


The reaction of two equivalents of (Me3Si)2RSi-K x 3THF (1 R = SiMe3, 2 R = Ph) with Cl2MeSi-SiMeCl2, followed by hydrolysis in the presence of NH4(NH2COO) leads to the formation of the dihydroxyoligosilanes MeR(HO)Si-Si(OH)RMe [4 R = Si(SiMe3)3, 6 R = Si(SiMe3)2Ph] as diastereomeric mixtures. Addition of two equivalents of n-BuLi to the diastereomerically pure ligands (meso)-4/6 and (rac )-4/6, respectively, and subsequent treatment with Cp2TiCl2 yields the (Z) and (E) arranged five-membered rings (MeRSi-O)2TiCp2 [7 R = Si(SiMe3)3, 8 R = Si(SiMe3)2Ph], respectively. The crystal structures of the ligand (rac)-6 as well as of the titanacycles (E)-8 and (Z)-7 are reported.

Original languageEnglish
Pages (from-to)1-8
Number of pages8
JournalJournal of Organometallic Chemistry
Issue number1-2
StatePublished - Nov 15 2002


  • Dihydroxydisilanes
  • Hexasilanes
  • Silicon
  • Titanacycles
  • Titanium


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