18001-76-8Relevant academic research and scientific papers
Une synthese originale et rapide de (methyldiethoxysilyl)benzenes fonctionnels
Cros, S.,Bennetau, B.,Dunogues, J.,Babin, P.
, p. 69 - 74 (2007/10/02)
In the presence of a catalytic amount of tetrakis(triphenylphosphine)palladium(0), the 1,1,2,2-tetraethoxydimethyldisilane reacts with various functional bromoarenes giving the corresponding aryldiethoxymethylsilanes in good yields.The creation of Si-CAr bonds involving a polyalcoxydisilane as the silylating reagent is here reported for the first time.Key words: Silyl; Palladium
Atrane Analogous Compounds of the Type (I)
Grobe, Joseph,Henkel, Gerald,Krebs, Bernt,Voulgarakis, Nikolaos
, p. 341 - 351 (2007/10/02)
Heterocyclic cage compounds of type I (compounds 8 - 10) have been prepared by condensation reactions of 1,2,2-trifunctional disilanes Me(R)XSiSiMeX2 (R = Me, Ph, OEt; X = NMe2, OEt) with triethanolamine using the "Dilution Principle".The starting compounds are obtained by Si - Me cleavage of Si2Me6 with acetylchloride/AlCl3 followed by either aminolysis with HNMe2 or alcoholysis with EtOH. 1H NMR spectra indicate N -> Si(1) intraction with the more acidic Si atom in 8 and 9.This result is proved by the X-ray structure analysis of 8 (monoclinic, P 21/c; a = 7.088(2), b = 15.070(4), c = 12.701(4) Angstroem, β = 104.96(2) at -130 deg C, Z = 4); the Si(1) *** N distance is found to be 2.768 Angstroem, connected with a significant angular distortion of the tetrahedral coordination around Si(1) towards a trigonal bipyramid.In compound 10, too, N -> Si(1) coordination is observed at room temperature in spite of almost equal acidity for both Si atoms.This can be explained by the preference of 5- over 6-membered chelating ring systems.At higher temperatures the 1H NMR spectra show a fluctuation of the N-donor between the two Si centres. - Key words: Silatranes, Transanular N -> Si-Interactions, NMR Spectra, X-Ray
