<i>cis,cis-</i>1,3,5-Trihydroxynonamethylcyclohexasilane: A Cyclopolysilane with Unusual Properties

Stueger, Harald; Albering, Joerg H.; Flock, Michaela; Fuerpass, Gottfried; Mitterfellner, Thomas

doi:10.1021/om200025n

Cited by 6 publications

(3 citation statements)

References 47 publications

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“…The asymmetric unit of 4b contains two individual molecules connected by an intermolecular hydrogen bond (Figure ). The intermolecular O–O distance of 2.80 Å compares well to the respective values found in other hydrogen-bonded cyclohexasilanols, -diols, and -triols. − Hydrogen bonding is also observed in the structures of simple silanols, silanediols, and silanetriols, leading to the formation of dimers (e.g. 2,6-Mes 2 C 6 H 3 Si(OH) 3 , d O–O = 2.86 Å) or larger aggregates (e.g.…”

Section: Resultssupporting

confidence: 71%

Sila-Peterson Reaction of Cyclic Silanides

et al. 2020

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Sila-Peterson type reactions of the 1,4,4-tris-( t r i m e t h y l s i l y l ) -1 -m e t a l l o o c t a m e t h y l c y c l o h e x a s i l a n e s (Me 3 Si) 2 Si 6 Me 8 (SiMe 3 )M (2a, M = Li; 2b, M = K) with various ketones were investigated. The obtained products strongly depend on the nature of the ketone component. With 2-adamantanone 2a,b afforded the moderately stable silene 3. 3 is the first example of an Apeloig−Ishikawa−Oehme-type silene with the tricoordinate silicon atom incorporated into a cyclopolysilane framework and could be characterized by NMR and UV spectroscopy as well as by trapping reactions with water, methanol, and MeLi. The reaction of 2b with aromatic ketones also follows a sila-Peterson type mechanism with formation of carbanionic species. With 1,2-diphenylcyclopropenone 2b reacted by conjugate 1,4-addition to give a spirocyclic carbanion. In most cases the underlying reaction mechanism could be elucidated by the isolation and characterization of unstable intermediates and final products after proper derivatization.

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Section: Resultssupporting

confidence: 71%

Sila-Peterson Reaction of Cyclic Silanides

et al. 2020

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“…Recently, the groups of Stueger and Krempner independently investigated the molecular structures and electronic properties of oxo-functionalized cyclohexasilanes and branched heptasilanes [110][111][112][113][114][115], respectively. Strong electronic coupling of oxygen-containing donor groups such as OR, OH and OSiR 3 with the silicon-silicon backbone (σ-n mixing) was noticed, resulting in a substantial decrease of the optical band gaps of these compounds.…”

Section: Electronic Effectsmentioning

confidence: 99%

Polysilane Dendrimers

Krempner

2012

Polymers

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Abstract:The synthesis, structure and electronic properties of polysilane dendrimers, a relatively new class of highly branched and silicon-rich molecular architectures is reviewed. After a detailed discussion of main synthetic strategies to well-defined single-core and double-core polysilane dendrimers, important structural and conformational features determined by single crystal X-ray crystallography and 29 Si-NMR spectroscopy are presented. The last part highlights the most interesting photochemical properties of polysilane dendrimers such as UV absorption and emission behavior, which are compared with those of linear and branched polysilanes.

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“…[12][13][14] To make a nanometer-thick thin lm by spin coating, the materials should be soluble in organic solvents and thermally and oxidatively stable in the air. We chose cyclosilanes [15][16][17][18][19][20] as chromophores, and synthesized a new condensation-polymer precursor, ethoxycyclosilane. The general properties of cyclosilanes are similar to those of aromatic compounds, which come from the delocalization of s(Si-Si) electrons.…”

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confidence: 99%