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Tridentate Lewis Acids: Boron‐, Silicon‐ and Gallium‐Functionalised Tris(dimethylsilyl)methanes
Author(s) -
Weisheim Eugen,
Schwartzen Anna,
Kuhlmann Lisa,
Neumann Beate,
Stammler HansGeorg,
Mitzel Norbert W.
Publication year - 2016
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201501432
Subject(s) - chemistry , lewis acids and bases , boron , gallium , yield (engineering) , silicon , medicinal chemistry , organic chemistry , polymer chemistry , catalysis , metallurgy , materials science
Flexible tridentate Lewis acids based on new trisilylmethane scaffolds with three ethynyl groups {Me 3 SiC[Si(Me) 2 C≡C–H] 3 } and three vinyl groups {Me 3 SiC[Si(Me) 2 CH=CH 2 ] 3 }, respectively, have been synthesised and functionalised by metallation with gallium organyls to yield Me 3 SiC[Si(Me) 2 C≡C–GaR 2 ] 3 (R = Me, Et). Hydrometallation of the trisilylmethane frameworks with HB(C 6 F 5 ) 2 and various chlorosilanes afforded flexible poly‐Lewis acids equipped with B(C 6 F 5 ) 2 , SiCl 3 , SiMeCl 2 and SiMe 2 Cl substituents. The reaction of these silicon‐containing tridentate Lewis acids with SbF 3 led to fluorine‐substituted poly‐Lewis acids of the type Me 3 SiC[Si(Me) 2 CH 2 CH 2 SiMe 3– n F n ] 3 ( n = 1–3). All the compounds were characterised by multinuclear NMR spectroscopy, mass spectrometry, elemental analyses and some by X‐ray diffraction.