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- W4200392313 abstract "Hydrogen-bridged oligosilanylsilyl borates 8 [B(C6 F5 )4 ], 9[B(C6 F5 )4 ] and diborates 10 [B(C6 F5 )4 ]2 have been prepared by hydride transfer between α-ω-dihydrido- (11) and branched tetrahydrido-oligosilanes (13) and trityl cation. The obtained cyclic intramolecularly stabilized silylium ions 8, 9 and bissilylium ion 10 were characterized by low temperature NMR spectroscopy supported by the results of density functional calculations. The branched Si-H-Si monocation 9 undergoes at low temperatures a fast degenerate rearrangement, which exchanges the Si-H groups with a barrier of 31 kJ mol-1 via an antarafacial transition state. Reaction of the branched monocation 9 with a second equivalent of trityl cation or of the branched oligosilane 13 with two equivalents of trityl cation, gives at -80 °C the corresponding bissilylium ion 10, an example for a new class of highly reactive poly-Lewis acids." @default.
- W4200392313 created "2021-12-31" @default.
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- W4200392313 date "2021-12-30" @default.
- W4200392313 modified "2023-09-24" @default.
- W4200392313 title "Hydrogen‐Bridged Oligosilanylsilyl Mono‐ and Oligosilanylsilyl Dications" @default.
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- W4200392313 doi "https://doi.org/10.1002/chem.202104318" @default.
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