Jürgen KahrFunctionalisation of silanetriolesAbstractThis work reports the research on the functionalisation of the hydrophilic and hydrophobic parts of silanetriols.The preparation of cyclopentylsilanetriol has been achieved through controlled hydrolysis of cyclopentyltrichlorosilane, and was characterised by NMR spectroscopy.For the first time, suitable crystals of dicyclopentyldisiloxanetetrol and hexa(cyclopentylsilsesquioxane) for X-ray diffraction could be obtained. Furthermore, these compounds were characterised by MS-analysis and their fragmentation pattern was assigned.t-Butylsilanetriole did not react with V2O5 in degassed or normal water, although the reaction was successful in non organic polare solvents. In contrast, it was possible to react NH4VO3 with t-butylsilanetriole in aqueous solution, since this precursor is more ionic.As a side reaction the formation of decavanadate could be observed, which seems to be a competing reaction to the condensation reaction of silanetriols. Decavanadate was characterised by single crystal analysis.During the reaction of oxovanadium(V)propoxide with t-butylsilanetriole the formation of the desired Si-O-V bond could be confirmed by NMR spectroscopy, IR and the appearance of n-propanol. However, the further reaction with n-propanol could not be inhibited and therefore the isolation of the Si-O-V intermediate was not possible.IR and NMR spectroscopy data suggest a cross linkage between silanetrioles and vanadium compounds, but a detailed characterisation was not possible.Furthermore, it was possible to synthesise pentafluorophenyltrichlorosilane via a two step reaction, with (C6F5)2SiCl2, (C6F5)3SiCl, (C6F5)4Si as side products. It was not possible to characterise the products of the hydrolysis of these fluorosilane compounds.