Vergleichende 29Si-NMR-untersuchungen an verschiedenen disilanderivaten

Söllradl, H.; Hengge, E.

doi:10.1016/s0022-328x(00)98547-4

Cited by 56 publications

(10 citation statements)

References 12 publications

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“…Ϫ [b] Taken from ref. [13] Ϫ [c] Taken from ref. [32] Figure 1 displays the proton coupled 29 Si NMR spectra of chlorodisilane and 1,2-dichlorodisilane exemplifying the quality of the spectra that have been obtained.…”

Section: Chlorodisilanesmentioning

confidence: 99%

“…From mixtures of chlorodisilanes, Söllradl and Hengge [13] deduced NMR parameters for all possible chlorodisilanes. The data presented here agree quite well with theirs.…”

Section: Chlorodisilanesmentioning

confidence: 99%

“…Methods which avoided Si 2 H 6 as a starting material comprised the reaction of monoiododisilane with AgCl, [10] the reaction of SiCl 2 H 2 in an electrical discharge [11,12] or the electrophilic cleavage of the Si-phenyl bonds of tetraphenyldisilane (and other phenyldisilanes) with HCl/AlCl 3 . [13] By these procedures, only Si 2 H 5 Cl could be obtained in pure form and in preparative quantities. The reaction of tetraphenyldisilane with HCl/AlCl 3 [13] had the disadvantage that the benzene which formed simultaneously could not be separated from the tetrachlorodisilane.…”

Section: Introductionmentioning

confidence: 99%

“…[13] By these procedures, only Si 2 H 5 Cl could be obtained in pure form and in preparative quantities. The reaction of tetraphenyldisilane with HCl/AlCl 3 [13] had the disadvantage that the benzene which formed simultaneously could not be separated from the tetrachlorodisilane. In 1979, the isolation of pentachlorodisilane from a mixture of chlorosilanes obtained as a byBoth disilanes are stable for weeks at room temperature, but undergo rapid H/Cl exchange reactions and SiSi cleavage upon the addition of traces of catalysts such as AlCl 3 .…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and Properties of 1,2-Dichlorodisilane and 1,1,2-Trichlorodisilane

Gupper¹,

Haßler²

2001

Eur. J. Inorg. Chem.

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The previously unknown disilanes 1,1,2-trichlorotri(1-naphthyl)disilane and 1,2-dichlorotetra(1-naphthyl)disilane were prepared by the reaction of 1-lithionaphthalenide with hexachlorodisilane. Reduction with LiAlH 4 afforded 1,1,2-tri(1-naphthyl)disilane. Treatment of 1,2-di(1-naphthyl)disilane and 1,1,2-tri(1-naphthyl)disilane with liquid hydrogen chloride gave ClH 2 SiSiH 2 Cl and ClH 2 SiSiHCl 2 in quantitative yields, along with naphthalene. The chlorodisilanes were easily separated and purified by fractional condensation.

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Section: Chlorodisilanesmentioning

confidence: 99%

“…From mixtures of chlorodisilanes, Söllradl and Hengge [13] deduced NMR parameters for all possible chlorodisilanes. The data presented here agree quite well with theirs.…”

Section: Chlorodisilanesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Synthesis and Properties of 1,2-Dichlorodisilane and 1,1,2-Trichlorodisilane

Gupper¹,

Haßler²

2001

Eur. J. Inorg. Chem.

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“…In the 29 Si NMR spectra ([D 8 ]toluene), the initial resonance of Ph 2 SiF 2 at À26.9 ppm disappeared and four new resonances (À33.09, À33.45, À36.8, and À37.0 ppm) in the disilane/polysilane region developed. [34] The solvent of the residual mixture was removed under vacuum and an EPR spectra was recorded. EPR (toluene): broad singlet at g = 1.976(9), identical to the literature data.…”

Section: Methodsmentioning

confidence: 99%

How a Thermally Unstable Metal Hydrido Complex Can Yield High Catalytic Activity Even at Elevated Temperatures

Ehm

Krüger

Lentz

2016

Chemistry A European J

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Despite their instability in ethereal solvents, organotitanium hydride catalysts are successfully employed in catalysis at moderate to high temperatures (110 °C), even in the presence of alcohols. It is shown computationally (bond dissociation energy (BDE) analysis and energetic profile for regeneration) and experimentally (EPR studies and kinetic studies), with the specific example of hydrodefluorination (HDF), that despite the long standing belief, regeneration of Ti-H bonds from Ti-F bonds using silanes is endergonic. The resulting low concentration of Ti-H species is crucial for the catalytic stability of those systems. The resting state in the catalysis is a Ti-F species. The most promising silanes for regeneration are not the ones that have the strongest Si-F bond, but the ones that show the largest difference in Si-F and Si-H BDEs.

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