Philosophie und Universität

Schneider, Ulrich Johannes

doi:10.28937/978-3-7873-2556-6

Cited by 6 publications

(3 citation statements)

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“…A closer look at the framework of 8 reveals a rather strong distortion from the cubic geometry, compared with the deviation in other titanasilsesquioxanes. 3c-f, This distortion is found in the solid state and also in solution and can be explained by the high steric demand of the 2,7-di- tert -butyl-9-(trimethylsilyl)fluorenyl groups. In the solid state, the titanium and silicon atoms adopt distorted tetrahedral geometries with bond angles that differ significantly from 109.5° (see Table ).…”

Section: Resultsmentioning

confidence: 95%

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Synthesis of Novel Titanasiloxanes with Ring and Cage Structures Using Sterically Demanding Substituents

et al. 2003

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Novel oligomeric titanasiloxanes have been synthesized in good yields by reaction of sterically demanding organosilanetriols with titanium alkoxides. The silanetriols tBu2(Me3Si)FlSi(OH)3 (5), (Me3Si)FlSi(OH)3 (6), and MeFlSi(OH)3 (7) and the titanium alkoxides Ti(OEt)4, Ti(OiPr)4, and Ti(OiPr)2(acac)2 have been used as starting materials (Fl = fluorenyl). Quite different structures are obtained by only small modifications of the organic substituents of the substrates. Thus, the condensation reactions result in the formation of the polyhedral titanasiloxanes [tBu2(Me3Si)FlSi]4O12[TiOEt]4 (8), [(Me3Si)FlSi]2O5[Ti(OEt)]4[μ2-OEt]6[μ4-O] (9), ([tBu2(Me3Si)FlSi]3O10[Ti(OiPr)]4[μ2-OiPr]2[μ3-O]Ti)2O (10), and [MeFlSi]2O8[Ti(OiPr)]6[μ2-OiPr]4[μ3-O]2[PhNH2]2 (11) and the cyclic titanasiloxane [MeFlSi(OiPr)]2O4[Ti(acac)2]2 (12). A 1:1 stoichiometry of the starting materials leads to 8 and 12 in quantitative yield, while 9−11 are isolated in minor quantities. If the appropriate substrate ratio is used, the latter compounds can also be obtained in high yields. All titanasiloxanes have been characterized by X-ray crystallography, NMR, IR, and elemental analysis.

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Section: Resultsmentioning

confidence: 95%

“…Cyclic and spirocyclic titanasiloxanes are readily accessible by condensation of silanediols or their dilithium salts with titanium chlorides . Polyhedral titanasiloxanes can be obtained by condensation of silanetriols with titanium alkoxides or chlorides. 2a, …”

Section: Introductionmentioning

confidence: 99%

Synthesis of Novel Titanasiloxanes with Ring and Cage Structures Using Sterically Demanding Substituents

et al. 2003

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“…In den Modellen 5 und 6 liegen die entsprechenden RR deutlich unter 2,00 (n.s.). [10,22] und die MONI-CA-Kohortenstudie in der Region Augsburg [23,24].…”

Section: Subjektive Einschätzung Des Gesundheitszustandes (Seg)unclassified

Subjektive Einschätzung der Gesundheit und Mortalitätsentwicklung

Helmert¹

2003

Gesundheitswesen

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Many international studies underline the importance of the health indicator "perceived general health" (PGH). For Germany, only few Longitudinal studies are available from recent years, dealing with the question whether PGH is a predictor for overall mortality. Based on a Mortality-Follow-up Study (n = 7212) under the auspices of the Federal Institute for Population Research the importance of the indicator PGH for the prediction of the mortality experience in the general population has been analysed for the period 1984 - 1998. The age-adjusted relative risk of "less than good health" for overall mortality is 2.11 (p <0.001) for males and 2.05 (p <0.001) for females (reference category: "good/very good health"). The relative risks for "poor health" are 4.32 (p <0,001) in males and 3.07 (p <0.001) in females. An inclusion of several control variables remarkably reduces these relative risks. The results indicate that the indicator "perceived general health" is an important predictor of overall mortality in Germany.

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Wundt’s Idea of a Scientific Philosophy

Araújo

2015

Wundt and the Philosophical Foundations of Psychology

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Philosophie und Universität

Cited by 6 publications

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Synthesis of Novel Titanasiloxanes with Ring and Cage Structures Using Sterically Demanding Substituents

Synthesis of Novel Titanasiloxanes with Ring and Cage Structures Using Sterically Demanding Substituents

Subjektive Einschätzung der Gesundheit und Mortalitätsentwicklung

Wundt’s Idea of a Scientific Philosophy

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