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Dalton Trans. 2017 Feb 14;46(6):1898-1913. doi: 10.1039/c6dt04608h.

Fluoride complexation by bidentate silicon Lewis acids.

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Bielefeld University, Faculty of Chemistry, Chair of Inorganic and Structural Chemistry, Centre for Molecular Materials CM2, Universit├Ątsstra├če 25, 33615 Bielefeld, Germany.


Diethynyldiphenylsilane (1) and divinyldiphenylsilane (2) were functionalized by hydrosilylation reactions with HSiMe2Cl, HSiMeCl2 and HSiCl3. Fluorination of the resulting compounds generates bidentate open-chain Lewis acids of increasing acidity. All semi-flexible [Ph2Si(CH[double bond, length as m-dash]CHSiFnMe3-n)2 (n = 1, 2, 3)] and flexible [Ph2Si(CH2-CH2SiFnMe3-n)2 (n = 1, 2, 3)] bidentate Lewis acids were obtained in good to excellent yields. The different fluoride ion complexation behavior was explored in detail by multinuclear (low temperature) NMR spectroscopy. The Lewis acidic bidentate molecules as well as the resulting mono- and bissilicates were completely characterized by NMR spectroscopy, mass spectrometry and in part by elemental analysis and X-ray diffraction experiments.


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