ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Synthese, Funktionalisierung und Vernetzung von Poly(silylenphenylenen) (1999)
    Springer
    Monatshefte für Chemie 130 (1999), S. 181-195 
    Details
    ISSN: 1434-4475
    Keywords: Keywords. Organosilicon polymers; Poly(silylenephenylenes); Silyl triflates.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary.  Treatment of 1,4-bis(bromomagnesium)benzene with p-anisyl-silyl-bis(triflates) gave poly(p-anisyl-silylenephenylenes) in high yields. The anisyl-silyl bond was cleaved selectively by triflic acid leading to triflate substituted poly(silylenephenylenes). Conversions of these polymers with nucleophiles afforded functionalized derivatives. Hydrosilylation reaction between silicon-vinyl and silicon-hydrogen derivatives results in polymer networks which may serve as interesting preceramic materials. The structures of the polymers were proven by NMR spectroscopy (29Si, 13C, 1H).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00010164
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Synthesis of functional substituted polycarbosilanes based on silyltriflate derivativesDedicated to Professor Egon Uhlig on the occasion of his 65th birthday (1995)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 33 (1995), S. 239-246 
    Details
    ISSN: 0887-624X
    Keywords: organosilicon polymer ; polycarbosilane ; protodesilylation ; silytriflate ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Polycarbosilanes obtained by the Wurtz method or Grignard synthesis were converted by protodesilylation with trifluoromethanesulfonic acid to triflate-substituted derivatives. Reactions of these polymers with nucleophiles led to novel functionally substituted polycarbosilanes. Polycarbosilanes with a regular alternating arrangement of silicon and carbon atoms, however, could not be obtained by this procedure. Such polymers were prepared by reactions of bis(trifluoromethylsulfonyioxysilyl)methanes with dinucleophiles. All syntheses are characterized by a high regioselectivity and high yields at low temperatures in short reaction times. The structures of the polymers were proven by NMR spectroscopy (29Si, 13C, 1H). © 1995 John Wiley & Sons, Inc.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1995.080330206
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Convenient approach to novel functional substituted and branched poly(silylenemethylenes) (1998)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 36 (1998), S. 725-735 
    Details
    ISSN: 0887-624X
    Keywords: organosilicon polymer ; poly(silylenemethylene) ; silyl triflate ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Novel poly(silylenemethylenes) have been prepared by the ring-opening polymerization of 1,3-disilacyclobutanes followed by a protodesilylation reaction with triflic acid. The silicon-aryl bond cleavage could be controlled by using different leaving groups, for instance phenyl- and para-anisyl substituents. The reactions of the triflate derivatives with organomagnesium compounds, LiAlH4, amines, or alcohols gave functional substituted poly(silylenemethylenes). Hydrosilylation reactions or reductive coupling with potassium-graphite led to organosilicon network-polymers, which may serve as suitable precursors for silicon carbide and Si/C/N-based materials. The structures of the polymers were identified by NMR spectroscopy (29Si, 13C, 1H). © 1998 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 36: 725-735, 1998
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
  • 4
    Electronic Resource
    Electronic Resource
    Silyl Triflates - Valuable Synthetic Materials in Organosilicon Chemistry (1996)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 129 (1996), S. 733-739 
    Details
    ISSN: 0009-2940
    Keywords: Silyl triflates ; Oligosilanes ; Polysilylated hydrocarbons ; Organosilicon polymers ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The highly reactive silyl triflates R4-nSi(OSO2CF3)n are valuable materials in organosilicon chemistry. Numerous new triflate derivatives of mono-, oligo-, and polysilanes were prepared by stepwise substitution of trifluoromethylsulfonyl groups for phenyl groups or other leaving groups. Conversions of silyl triflates with nucleophiles proceed regioselectively and, in most cases, quantitatively at low temperatures with short reaction times. Therefore, silyl triflates are suitable reagents for the synthesis and functionalization of linear and cyclic oligosilanes. Novel polycarbosilanes, polysilylalkynes, and polysilylphenylenes, which show a regular alternating arrangement of silylene groups and organic units, were prepared from α,ω-bis[(trifluoromethylsulfonyloxy)silyl]-substituted compounds and dinucleophiles. Branched polysilanes and polysilynes were obtained by reductive coupling of polymeric silyl triflates with potassium-graphite.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19961290702
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Darstellung neuartiger monomerer, oligomerer und polymerer Silyltriflate (1992)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 125 (1992), S. 47-53 
    Details
    ISSN: 0009-2940
    Keywords: Silyl triflates ; Oligosilanes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Preparation of New Monomeric, Oligomeric, and Polymeric Silyl TriflatesThe highly reactive silyl triflates R3SiOSO2CF3 are valuable reagents in organosilicon chemistry. New triflate derivatives of mono- and oligosilanes have been prepared by substitution of phenyl groups or hydrogen atoms for the trifluoromethanesulfonyl group. The presence of the electron-withdrawing triflate group leads to a strong deactivation of the other substituents at the silicon atom, and the displacement of a second phenyl group at the same silicon atom is much slower than the first step. For this reason in the case of phenylated oligosilanes stepwise monosubstitution of the silicon atoms has been found. Other new oligomeric silyl triflates are obtained by reaction of silanediyl(triyl) bis(tris)(trifluoromethanesulfonates) with lithium derivatives of organosilicon compounds. Finally, the cleavage of silicon-phenyl bonds of poly[methyl(phenyl)silanes] by CF3SO3H leads to triflate derivatives of polysilanes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19921250109
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Phenylenbis(silandiyl-triflate) als neuartige Synthesebausteine für vielfältig strukturierte Organosilizium-Polymere (1994)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 77 (1994), S. 972-980 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Phenylenebis(silandiyl triflates) - New Synthetic Building Blocks for Variously Structured Organosilicon PolymersOrtho-, meta-, and para-substituted phenylenebis(silandiyl triflates) are prepared as new useful building blocks for the synthesis of polymers with a regular alternating arrangement of an organosilicon unit and a π-electron system (phenylene or ethynylene) in the backbone. Such polymers can be used as photoresists, semiconducting materials or precursors of silicon carbide. The phenylenebis(silandiyl-triflates) 5a-c are obtained by protodesilylation of the corresponding (allylsilyl)- or [(diethylamino)silyl]benzenes 3a-c and 4a-c, respectively, with trifluoromethanesulfonic acid. Reactions with dinucleophiles like Li2C2 and Ph2Si(OH)2 lead to variously structured organosilicon polymers (see Eqns. 11 and 12), which are characterized by spectroscopic methods.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19940770409
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Bis(trifluormethylsulfonyloxy)organosilicium-Verbindungen als Synthesebausteine für neuartige Siliciumpolymere (1994)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 127 (1994), S. 985-990 
    Details
    ISSN: 0009-2940
    Keywords: Silyl triflates ; Polysiloxanes ; Polycarbosilanes ; Polysilylenealkynes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Bis(trifluoromethylsulfonyloxy)organosilicon Compounds as Synthetic Materials for New Silicon PolymersThe new polycarbosilanes, polysiloxanes, and polysilylenealkynes 1c-6c were obtained by condensation of electrophilic α,ω-bis(trifluoromethylsulfonyloxy)organosilicon compounds 1b-6b with nucleophiles such as organolithium and organomagnesium compounds. The required silyl triflate derivatives 1b-6b have been prepared by reaction of the corresponding amino-, allyl-, or phenylsilanes 1a-6a with trifluoromethanesulfonic acid.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19941270604
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    facet.materialart.
    Unknown
    Phenylenbis(silandiyl-triflate) als neuartige Synthesebausteine für vielfältig strukturierte Organosilizium-Polymere (1994)
    Wiley
    Details
    Publication Date: 1994-06-29
    Print ISSN: 0018-019X
    Electronic ISSN: 1522-2675
    Topics: Chemistry and Pharmacology
    Published by Wiley
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...